Hello Year 5! Today, we’re going to learn about rounding very large numbers. Rounding helps us simplify numbers, making them easier to understand and work with. Let’s break it down step by step!

What is Rounding?

Rounding is when we change a number to make it simpler, but it stays close to the original value. For example, if you have 47, you can round it to 50 because 50 is easier to use in your calculations.

Why Do We Round?

Rounding is useful when:

  • We want to make big numbers easier to read.
  • We need to estimate quickly.
  • We want to compare numbers easily.

How to Round Very Large Numbers

Key Rules for Rounding

  1. Look at the digit to the right: Decide whether to round up or down.
  2. If that digit is 5 or more, round up. For example, if you’re rounding 4,356 to the nearest thousand:
    • The thousands digit is 4.
    • The hundreds digit is 3 (less than 5), so we keep it as 4.
    • Answer: 4,000.
  3. If that digit is less than 5, round down. For example, rounding 4,678 to the nearest thousand:
    • The thousands digit is 4.
    • The hundreds digit is 6 (5 or more), so we round up.
    • Answer: 5,000.

Examples

  1. Rounding 12,345 to the nearest thousand:
    • The thousands digit is 12.
    • The hundreds digit is 3 (less than 5).
    • Answer: 12,000.
  2. Rounding 89,999 to the nearest ten thousand:
    • The ten thousands digit is 8.
    • The thousands digit is 9 (5 or more).
    • Answer: 90,000.

Tips and Tricks

  • Use number lines: Draw a number line to see where the number falls.
  • Memorise key rounding points: Remember that 0-4 means round down, and 5-9 means round up.
  • Practice with real-life examples: Think of large numbers in your life, like populations or distances, and practice rounding them.

Questions on Rounding Very Large Numbers

Easy Level Questions

  1. Round 1,234 to the nearest hundred.
  2. Round 5,678 to the nearest thousand.
  3. Round 8,999 to the nearest hundred.
  4. Round 23,456 to the nearest thousand.
  5. Round 45,678 to the nearest ten thousand.
  6. Round 67,890 to the nearest hundred.
  7. Round 12,345 to the nearest ten.
  8. Round 3,210 to the nearest hundred.
  9. Round 4,500 to the nearest thousand.
  10. Round 25,678 to the nearest thousand.
  11. Round 89,000 to the nearest hundred.
  12. Round 90,123 to the nearest ten thousand.
  13. Round 33,333 to the nearest hundred.
  14. Round 56,789 to the nearest thousand.
  15. Round 78,901 to the nearest hundred.
  16. Round 21,456 to the nearest ten.
  17. Round 99,999 to the nearest thousand.
  18. Round 1,111 to the nearest hundred.
  19. Round 2,222 to the nearest hundred.
  20. Round 3,333 to the nearest thousand.

Medium Level Questions

  1. Round 123,456 to the nearest thousand.
  2. Round 456,789 to the nearest ten thousand.
  3. Round 789,012 to the nearest hundred thousand.
  4. Round 234,567 to the nearest ten thousand.
  5. Round 654,321 to the nearest thousand.
  6. Round 987,654 to the nearest hundred.
  7. Round 321,098 to the nearest thousand.
  8. Round 876,543 to the nearest ten.
  9. Round 1,234,567 to the nearest hundred thousand.
  10. Round 5,678,901 to the nearest million.
  11. Round 2,345,678 to the nearest ten thousand.
  12. Round 3,456,789 to the nearest thousand.
  13. Round 4,567,890 to the nearest hundred thousand.
  14. Round 5,678,901 to the nearest million.
  15. Round 6,789,012 to the nearest ten.
  16. Round 7,890,123 to the nearest hundred thousand.
  17. Round 8,901,234 to the nearest thousand.
  18. Round 9,012,345 to the nearest hundred.
  19. Round 1,123,456 to the nearest thousand.
  20. Round 2,234,567 to the nearest million.

Hard Level Questions

  1. Round 1,234,567 to the nearest hundred thousand.
  2. Round 2,345,678 to the nearest ten million.
  3. Round 3,456,789 to the nearest million.
  4. Round 4,567,890 to the nearest hundred thousand.
  5. Round 5,678,901 to the nearest million.
  6. Round 6,789,012 to the nearest ten thousand.
  7. Round 7,890,123 to the nearest hundred thousand.
  8. Round 8,901,234 to the nearest million.
  9. Round 9,012,345 to the nearest ten million.
  10. Round 10,123,456 to the nearest hundred thousand.
  11. Round 11,234,567 to the nearest million.
  12. Round 12,345,678 to the nearest thousand.
  13. Round 13,456,789 to the nearest hundred million.
  14. Round 14,567,890 to the nearest thousand.
  15. Round 15,678,901 to the nearest million.
  16. Round 16,789,012 to the nearest hundred thousand.
  17. Round 17,890,123 to the nearest million.
  18. Round 18,901,234 to the nearest ten thousand.
  19. Round 19,012,345 to the nearest hundred.
  20. Round 20,123,456 to the nearest million.

Answers to Rounding Questions

Easy Level Answers

  1. 1,200
  2. 6,000
  3. 9,000
  4. 23,000
  5. 50,000
  6. 68,000
  7. 12,350
  8. 3,200
  9. 5,000
  10. 26,000
  11. 89,000
  12. 90,000
  13. 33,300
  14. 56,800
  15. 79,000
  16. 21,460
  17. 100,000
  18. 1,100
  19. 2,200
  20. 3,000

Medium Level Answers

  1. 123,000
  2. 460,000
  3. 800,000
  4. 230,000
  5. 654,000
  6. 988,000
  7. 321,000
  8. 876,540
  9. 1,200,000
  10. 6,000,000
  11. 2,300,000
  12. 3,457,000
  13. 4,600,000
  14. 5,700,000
  15. 6,790,000
  16. 7,900,000
  17. 8,900,000
  18. 9,010,000
  19. 1,120,000
  20. 2,200,000

Hard Level Answers

  1. 1,200,000
  2. 3,000,000
  3. 3,500,000
  4. 4,600,000
  5. 5,700,000
  6. 6,790,000
  7. 7,900,000
  8. 8,900,000
  9. 10,000,000
  10. 10,100,000
  11. 12,300,000
  12. 12,300
  13. 10,000,000
  14. 14,600
  15. 15,700,000
  16. 16,800,000
  17. 17,900,000
  18. 18,900
  19. 19,000,000
  20. 20,100,000

I hope this helps you understand rounding very large numbers better! Keep practicing, and you’ll become a rounding expert in no time!