Chapter 1

Rounding Off Numbers

5 or more, round up; 4 or less, keep it the same. Rounding makes big numbers easy to handle!

Rounding off numbers

Rounding off changes a number to a nearby, tidy number. Look at the digit just to the right of the place you are rounding to. If it is 5 or more, round up. If it is 4 or less, round down (stay the same).

Key idea / 要点

Digit is 0–4 → round down. Digit is 5–9 → round up. All digits after the rounding place become 0.

Rounding to the nearest thousand

Check the hundreds digit to decide whether to round up or down.

Worked example / 例题

Round 3 476 to the nearest thousand. The hundreds digit is 4, which is less than 5, so we round down: 3 476 → 3 000. But 3 600 has a hundreds digit of 6, which is 5 or more, so it rounds up to 4 000.

Remember / 记住

  • 5 and above rounds up.
  • 4 and below stays the same.
  • Exactly halfway (like 6 500) rounds up.

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