Dividing decimals: powers of ten, models and estimates
Answers are for parents and teachers.
1
Work out 4,200 ÷ 10, 4,200 ÷ 100 and 4,200 ÷ 1,000.
420; 42; 4.2.
2
A 9 m cloth is cut into 100 equal strips. How long is each strip in metres and in centimetres?
9 ÷ 100 = 0.09 m = 9 cm.
3
Use tenths to work out 1.6 ÷ 4 and 0.6 ÷ 5.
16 tenths ÷ 4 = 4 tenths = 0.4. 0.6 = 60 hundredths, and 60 ÷ 5 = 12 hundredths = 0.12.
4
Estimate 59.4 ÷ 6, then say whether 0.99 or 9.9 is the exact answer.
60 ÷ 6 = 10, so the exact answer is 9.9 (6 × 9.9 = 59.4).
5
Mariam fills 0.15 L cups from a 1.5 L bottle. How many cups can she fill?
1.5 L = 150 hundredths and 0.15 L = 15 hundredths. 150 ÷ 15 = 10 cups.