{
  "title": "Estimating by Rounding - Grade 5 CBSE",
  "total_questions": 100,
  "questions": [
   {"id": 1, "difficulty": "easy", "question": "Estimate the sum by rounding to the nearest ten: 34 + 52.", "options": {"A": "90", "B": "80", "C": "100", "D": "70"}, "correct_answer": "A"},
  {"id": 2, "difficulty": "easy", "question": "Estimate the difference by rounding to the nearest ten: 87 - 29.", "options": {"A": "60", "B": "50", "C": "70", "D": "40"}, "correct_answer": "A"},
{"id": 3, "difficulty": "easy", "question": "Estimate the product by rounding: 18 × 7", "options": {"A": "120", "B": "180", "C": "200", "D": "140"}, "correct_answer": "D"}, {"id": 4, "difficulty": "easy", "question": "Estimate the sum: 46 + 33 (round to nearest ten).", "options": {"A": "80", "B": "70", "C": "90", "D": "60"}, "correct_answer": "A"},
  {"id": 5, "difficulty": "easy", "question": "Estimate: 145 rounded to the nearest hundred.", "options": {"A": "100", "B": "200", "C": "150", "D": "140"}, "correct_answer": "A"},
  {"id": 6, "difficulty": "easy", "question": "Estimate the difference: 121 - 48 (round to nearest ten).", "options": {"A": "70", "B": "60", "C": "80", "D": "90"}, "correct_answer": "A"},
  {"id": 7, "difficulty": "easy", "question": "Estimate: 67 rounded to the nearest ten.", "options": {"A": "70", "B": "60", "C": "80", "D": "50"}, "correct_answer": "A"},
  {"id": 8, "difficulty": "easy", "question": "Estimate: 38 rounded to the nearest ten.", "options": {"A": "40", "B": "30", "C": "50", "D": "20"}, "correct_answer": "A"},
  {"id": 9, "difficulty": "easy", "question": "Estimate the product: 19 × 5 (round 19 to nearest ten).", "options": {"A": "100", "B": "90", "C": "110", "D": "80"}, "correct_answer": "A"},
  {"id": 10, "difficulty": "easy", "question": "Estimate the sum: 128 + 43 (round to nearest ten).", "options": {"A": "170", "B": "180", "C": "160", "D": "150"}, "correct_answer": "A"},
  {"id": 11, "difficulty": "easy", "question": "Estimate the difference: 204 - 78 (round to nearest ten).", "options": {"A": "130", "B": "120", "C": "140", "D": "150"}, "correct_answer": "A"},
  {"id": 12, "difficulty": "easy", "question": "Estimate the sum: 56 + 21.", "options": {"A": "80", "B": "70", "C": "90", "D": "60"}, "correct_answer": "A"},
  {"id": 13, "difficulty": "easy", "question": "Estimate the product: 32 × 3 (round 32 to nearest ten).", "options": {"A": "90", "B": "100", "C": "80", "D": "70"}, "correct_answer": "A"},
  {"id": 14, "difficulty": "easy", "question": "Estimate: 251 rounded to nearest hundred.", "options": {"A": "300", "B": "200", "C": "250", "D": "280"}, "correct_answer": "A"},
  {"id": 15, "difficulty": "easy", "question": "Estimate: 78 rounded to nearest ten.", "options": {"A": "80", "B": "70", "C": "90", "D": "60"}, "correct_answer": "A"},
  {"id": 16, "difficulty": "easy", "question": "Estimate the sum: 402 + 198.", "options": {"A": "600", "B": "500", "C": "700", "D": "550"}, "correct_answer": "A"},
  {"id": 17, "difficulty": "easy", "question": "Estimate the difference: 503 - 289.", "options": {"A": "200", "B": "250", "C": "300", "D": "150"}, "correct_answer": "A"},
  {"id": 18, "difficulty": "easy", "question": "Estimate the product: 14 × 6 (round 14 to ten).", "options": {"A": "60", "B": "70", "C": "80", "D": "50"}, "correct_answer": "A"},
  {"id": 19, "difficulty": "easy", "question": "Estimate the sum: 29 + 51.", "options": {"A": "80", "B": "70", "C": "90", "D": "60"}, "correct_answer": "A"},
  {"id": 20, "difficulty": "easy", "question": "Estimate the difference: 94 - 28 (round to nearest ten).", "options": {"A": "70", "B": "60", "C": "80", "D": "50"}, "correct_answer": "A"}
,
{"id": 21, "difficulty": "medium", "question": "Estimate the sum by rounding to the nearest ten: 158 + 267.", "options": {"A": "420", "B": "430", "C": "410", "D": "400"}, "correct_answer": "A"},
  {"id": 22, "difficulty": "medium", "question": "Estimate the difference by rounding to the nearest hundred: 825 - 389.", "options": {"A": "400", "B": "500", "C": "300", "D": "450"}, "correct_answer": "A"},
  {"id": 23, "difficulty": "medium", "question": "Estimate the product by rounding to the nearest ten: 46 × 32.", "options": {"A": "1500", "B": "1400", "C": "1600", "D": "1300"}, "correct_answer": "A"},
  {"id": 24, "difficulty": "medium", "question": "A bag costs Rs. 248 and a bottle costs Rs. 167. Estimate the total cost by rounding to the nearest ten.", "options": {"A": "420", "B": "410", "C": "430", "D": "400"}, "correct_answer": "A"},
  {"id": 25, "difficulty": "medium", "question": "Estimate the sum by rounding to the nearest hundred: 367 + 489.", "options": {"A": "900", "B": "800", "C": "700", "D": "950"}, "correct_answer": "A"},
  {"id": 26, "difficulty": "medium", "question": "Estimate the difference: 912 - 478 by rounding to the nearest ten.", "options": {"A": "430", "B": "420", "C": "440", "D": "450"}, "correct_answer": "A"},
  {"id": 27, "difficulty": "medium", "question": "Estimate the product: 78 × 42 by rounding to the nearest ten.", "options": {"A": "3200", "B": "3300", "C": "3100", "D": "3000"}, "correct_answer": "A"},
  {"id": 28, "difficulty": "medium", "question": "A jacket costs Rs. 749 and shoes cost Rs. 1289. Estimate the total cost by rounding to the nearest hundred.", "options": {"A": "2000", "B": "2100", "C": "1900", "D": "2200"}, "correct_answer": "A"},
  {"id": 29, "difficulty": "medium", "question": "Estimate the sum: 147 + 286 + 119 by rounding to the nearest ten.", "options": {"A": "550", "B": "540", "C": "560", "D": "530"}, "correct_answer": "A"},
  {"id": 30, "difficulty": "medium", "question": "Estimate the difference: 1760 - 843 by rounding to the nearest hundred.", "options": {"A": "900", "B": "800", "C": "1000", "D": "950"}, "correct_answer": "A"},
  {"id": 31, "difficulty": "medium", "question": "Estimate the product: 64 × 58 by rounding to the nearest ten.", "options": {"A": "3600", "B": "3500", "C": "3700", "D": "3400"}, "correct_answer": "A"},
  {"id": 32, "difficulty": "medium", "question": "A truck traveled 378 km on Monday and 529 km on Tuesday. Estimate the total distance by rounding to the nearest hundred.", "options": {"A": "900 km", "B": "800 km", "C": "1000 km", "D": "850 km"}, "correct_answer": "A"},
  {"id": 33, "difficulty": "medium", "question": "Estimate the sum: 248 + 367 by rounding to the nearest ten.", "options": {"A": "620", "B": "610", "C": "630", "D": "600"}, "correct_answer": "A"},
  {"id": 34, "difficulty": "medium", "question": "Estimate the difference: 1542 - 689 by rounding to the nearest hundred.", "options": {"A": "900", "B": "800", "C": "1000", "D": "950"}, "correct_answer": "A"},
  {"id": 35, "difficulty": "medium", "question": "Estimate the product: 93 × 27 by rounding to the nearest ten.", "options": {"A": "2500", "B": "2600", "C": "2400", "D": "2300"}, "correct_answer": "A"},
  {"id": 36, "difficulty": "medium", "question": "Two classes have 47 and 58 students. Estimate the total number by rounding to the nearest ten.", "options": {"A": "100", "B": "90", "C": "110", "D": "120"}, "correct_answer": "A"},
  {"id": 37, "difficulty": "medium", "question": "Estimate the sum: 567 + 843 by rounding to the nearest hundred.", "options": {"A": "1400", "B": "1300", "C": "1500", "D": "1200"}, "correct_answer": "A"},
  {"id": 38, "difficulty": "medium", "question": "Estimate the difference: 1280 - 486 by rounding to the nearest ten.", "options": {"A": "800", "B": "790", "C": "810", "D": "820"}, "correct_answer": "A"},
  {"id": 39, "difficulty": "medium", "question": "Estimate the product: 84 × 67 by rounding to the nearest ten.", "options": {"A": "5600", "B": "5500", "C": "5700", "D": "5800"}, "correct_answer": "A"},
  {"id": 40, "difficulty": "medium", "question": "A store has 38 boxes with 42 items each. Estimate the total items by rounding to the nearest ten.", "options": {"A": "1600", "B": "1500", "C": "1700", "D": "1400"}, "correct_answer": "A"}
 ,
  {
    "id": 41,
    "difficulty": "hard",
    "question": "Estimate the sum: 12,345 + 45,678 by rounding to the nearest thousand.",
    "options": {
      "A": "58000",
      "B": "59000",
      "C": "57000",
      "D": "60000"
    },
    "correct_answer": "A"
  },
  {
    "id": 42,
    "difficulty": "hard",
    "question": "Estimate the difference: 50,000 - 12,345 by rounding to the nearest hundred.",
    "options": {
      "A": "37600",
      "B": "37700",
      "C": "37500",
      "D": "37800"
    },
    "correct_answer": "B"
  },
  {
    "id": 43,
    "difficulty": "hard",
    "question": "Estimate the product: 567 x 234 by rounding to the nearest ten.",
    "options": {
      "A": "133000",
      "B": "132000",
      "C": "134000",
      "D": "131000"
    },
    "correct_answer": "C"
  },
 {"id": 44, "difficulty": "hard", "question": "A city has 123,456 people. Another has 234,567 people. Estimate the total population by rounding to the nearest ten thousand.", "options": {"A": "360000", "B": "350000", "C": "370000", "D": "340000"}, "correct_answer": "B"},
  {
    "id": 45,
    "difficulty": "hard",
    "question": "Estimate the sum: 456,789 + 123,456 by rounding to the nearest thousand.",
    "options": {
      "A": "580000",
      "B": "579000",
      "C": "581000",
      "D": "582000"
    },
    "correct_answer": "A"
  },
  {
    "id": 46,
    "difficulty": "hard",
    "question": "Estimate the difference: 1,000,000 - 456,789 by rounding to the nearest ten thousand.",
    "options": {
      "A": "543000",
      "B": "544000",
      "C": "542000",
      "D": "545000"
    },
    "correct_answer": "B"
  },
  {
    "id": 47,
    "difficulty": "hard",
    "question": "Estimate the product: 789 x 456 by rounding to the nearest hundred.",
    "options": {
      "A": "360000",
      "B": "359000",
      "C": "361000",
      "D": "358000"
    },
    "correct_answer": "C"
  },
  {
    "id": 48,
    "difficulty": "hard",
    "question": "Estimate earnings: 567,890 + 345,678",
    "options": {
      "A": "910000",
      "B": "920000",
      "C": "930000",
      "D": "900000"
    },
    "correct_answer": "B"
  },
  {
    "id": 49,
    "difficulty": "hard",
    "question": "Estimate the sum: 987,654 + 123,456 by rounding to the nearest lakh.",
    "options": {
      "A": "1110000",
      "B": "1100000",
      "C": "1120000",
      "D": "1090000"
    },
    "correct_answer": "A"
  },
  {
    "id": 50,
    "difficulty": "hard",
    "question": "Estimate the difference: 500,000 - 123,456 by rounding to the nearest thousand.",
    "options": {
      "A": "376000",
      "B": "377000",
      "C": "375000",
      "D": "378000"
    },
    "correct_answer": "B"
  },
  {
    "id": 51,
    "difficulty": "hard",
    "question": "Estimate the product: 1234 x 567 by rounding to the nearest hundred.",
    "options": {
      "A": "720000",
      "B": "699000",
      "C": "701000",
      "D": "698000"
    },
    "correct_answer": "C"
  },
  {
    "id": 52,
    "difficulty": "hard",
    "question": "A country has 2,345,678 people. Estimate the population to the nearest lakh.",
    "options": {
      "A": "2300000",
      "B": "2400000",
      "C": "2350000",
      "D": "2340000"
    },
    "correct_answer": "D"
  },
  {
    "id": 53,
    "difficulty": "hard",
    "question": "Estimate the sum: 1,234,567 + 876,543 by rounding to the nearest lakh.",
    "options": {
      "A": "2110000",
      "B": "2100000",
      "C": "2120000",
      "D": "2090000"
    },
    "correct_answer": "A"
  },
  {
    "id": 54,
    "difficulty": "hard",
    "question": "Estimate the difference: 9,876,543 - 1,234,567 by rounding to the nearest ten lakh.",
    "options": {
      "A": "8600000",
      "B": "8700000",
      "C": "8500000",
      "D": "8800000"
    },
    "correct_answer": "B"
  },
  {
    "id": 55,
    "difficulty": "hard",
    "question": "Estimate the product: 2345 x 678 by rounding to the nearest ten.",
    "options": {
      "A": "1590000",
      "B": "1580000",
      "C": "1600000",
      "D": "1610000"
    },
    "correct_answer": "C"
  },
  {
    "id": 56,
    "difficulty": "hard",
    "question": "A city has 4,567,890 people. Estimate to the nearest lakh.",
    "options": {
      "A": "4600000",
      "B": "4700000",
      "C": "4500000",
      "D": "4800000"
    },
    "correct_answer": "D"
  },
  {
    "id": 57,
    "difficulty": "hard",
    "question": "Estimate the sum: 345,678 + 789,123 by rounding to the nearest thousand.",
    "options": {
      "A": "1130000",
      "B": "1120000",
      "C": "1140000",
      "D": "1110000"
    },
    "correct_answer": "A"
  },
  {
    "id": 58,
    "difficulty": "hard",
    "question": "Estimate the difference: 2,000,000 - 678,999 by rounding to the nearest lakh.",
    "options": {
      "A": "1300000",
      "B": "1200000",
      "C": "1400000",
      "D": "1100000"
    },
    "correct_answer": "B"
  },
  {
    "id": 59,
    "difficulty": "hard",
    "question": "Estimate the product: 987 x 654 by rounding to the nearest hundred.",
    "options": {
      "A": "650000",
      "B": "640000",
      "C": "660000",
      "D": "670000"
    },
    "correct_answer": "C"
  },
  {
    "id": 60,
    "difficulty": "hard",
    "question": "A country exports goods worth 8,76,543 rupees and imports goods worth 5,43,210 rupees. Estimate the total trade by rounding to the nearest lakh.",
    "options": {
      "A": "1400000",
      "B": "1300000",
      "C": "1500000",
      "D": "1200000"
    },
    "correct_answer": "D"
  } ]
}