 1. Rounding

When rounding to the nearest 10, 100 etc or to a specific number of decimal places/significant figures, if the digit after the cut−off point is 5 or above, round up − if it’s under 5, round down. # 1

Round 2.578 to two decimal places.

8 is the number after two decimal places and is above 5 so round up.

2.58 # 2

Round 0.005708 to three significant figures.

The first non zero number i.e. significant figure is 5. 8 is the number after three significant figures and is above 5 so round up.

0.00571 # 3

Round 12,563 to two significant figures.

5 is the number after two significant figures and is 5 or above so round up.

13,000 # 4

Round 6.453 to two decimal places.

3 is the number after two decimal places and is below 5 so round down.

6.45 # 5

An classroom seats 32 pupils. On a given day only 13 pupils are present, calculate the part of seats that are filled as a percentage. Give your answer to the nearest whole number.

(13/32) × 100% = 40.625%
The answer to the nearest whole number is 41%.

41% End of page