15. Round these decimals to the nearest whole unit. (Hint: To the whole unit to which it is closer.)
a) 7 b) 7.6 8
87 87.1 c)
88
4
4.3 4.32 d) 47 47.77
16. What is the nearest whole centimetre to each of the following? a) 9.2cm d) 46.5cm
b) 14.7cm e) 85.8cm
Rounding Numbers to 1 Decimal Place
If you are asked to round a number to 1 decimal place, you must say the tenth that is closest to that number. (Multiples of tenths are 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 and so on.) It helps to look at a number line.
For example: Round 12.47 to one decimal place, i.e. the nearest tenth. 12.4 12.41 12.42 12.43 12.44 12.45 12.46 12.47 12.48 12.49 12.5
c) 28.1cm f) 70.3cm
48
5
Is 12.47 closer to 12.4 or 12.5?
Look at where 12.47 is on the number line. To which tenth is it closer: 12.4 or 12.5? It is closer to 12.5. Therefore, 12.47 rounds up to the nearest tenth, i.e. 12.5.