What is Rounding?

Rounding is a way to make a number simpler and easier to work with. We do this by changing the number to the nearest whole number, ten, hundred, or any other value. This helps us when we want to estimate or make quick calculations.

Why Do We Round Numbers?

  1. Simplifying calculations: It makes maths easier.
  2. Estimating: Helps us get a quick idea of a number without calculating exactly.
  3. Making numbers easier to read: It can make big numbers more manageable.

Key Rules for Rounding

  1. Look at the number to the right: This is the number which is one place to the right of the place you’re rounding to.
  2. Decide whether to round up or down:
    • If the number is 5 or more, round up.
    • If the number is 4 or less, round down.

Examples

  • Rounding to the nearest ten:
    • 34 → Look at the 4 (right of the 3).
      • 4 is less than 5, so round down: 30.
    • 67 → Look at the 7 (right of the 6).
      • 7 is 5 or more, so round up: 70.
  • Rounding to the nearest hundred:
    • 245 → Look at the 4 (right of the 2).
      • 4 is less than 5, so round down: 200.
    • 876 → Look at the 7 (right of the 8).
      • 7 is 5 or more, so round up: 900.

Tips and Tricks for Rounding

  • Use a number line: Draw a number line to see where the number falls between two rounded numbers.
  • Practice with real-life examples: Use things like money or distances to practice rounding.
  • Use friendly numbers: Round to numbers that are easy to work with, like 10, 20, 50, or 100.

Questions for Practice

Easy Level Questions

  1. Round 23 to the nearest ten.
  2. Round 47 to the nearest ten.
  3. Round 75 to the nearest ten.
  4. Round 12 to the nearest ten.
  5. Round 59 to the nearest ten.
  6. Round 82 to the nearest ten.
  7. Round 34 to the nearest ten.
  8. Round 68 to the nearest ten.
  9. Round 41 to the nearest ten.
  10. Round 90 to the nearest ten.

Medium Level Questions

  1. Round 145 to the nearest hundred.
  2. Round 289 to the nearest hundred.
  3. Round 432 to the nearest hundred.
  4. Round 673 to the nearest hundred.
  5. Round 857 to the nearest hundred.
  6. Round 190 to the nearest hundred.
  7. Round 234 to the nearest hundred.
  8. Round 768 to the nearest hundred.
  9. Round 582 to the nearest hundred.
  10. Round 499 to the nearest hundred.

Hard Level Questions

  1. Round 3456 to the nearest thousand.
  2. Round 6789 to the nearest thousand.
  3. Round 1234 to the nearest hundred.
  4. Round 4567 to the nearest hundred.
  5. Round 9876 to the nearest thousand.
  6. Round 5432 to the nearest thousand.
  7. Round 8765 to the nearest hundred.
  8. Round 2345 to the nearest hundred.
  9. Round 7654 to the nearest thousand.
  10. Round 3450 to the nearest hundred.

Answers and Explanations

Easy Level Answers

  1. 20
  2. 50
  3. 80
  4. 10
  5. 60
  6. 80
  7. 30
  8. 70
  9. 40
  10. 90

Medium Level Answers

  1. 100
  2. 300
  3. 400
  4. 700
  5. 900
  6. 200
  7. 200
  8. 800
  9. 600
  10. 500

Hard Level Answers

  1. 3000
  2. 7000
  3. 1200
  4. 4600
  5. 9000
  6. 5000
  7. 8000
  8. 2300
  9. 8000
  10. 3400

Remember to use these rules and tips when rounding numbers. Practice makes perfect, so keep trying until you feel confident! Happy rounding!