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Decimal Operations Challenge
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Decimal Operations Challenge
Show your working for calculation questions. Include units where needed.
Decimal place value and rounding
1.In 6.482, what is the value of the digit 8?
- 8
- 0.8
- 0.08
- 0.008
2.Which number is the smallest?
- 3.405
- 3.45
- 3.054
- 3.5
3.Round 8.36 to the nearest tenth. Use the number line to help you locate the number.
4.A reusable drink bottle costs NZ$6.80. What is the cost of 4 bottles?
- NZ$24.20
- NZ$26.80
- NZ$27.20
- NZ$28.40
Calculate with decimals
5.Calculate 6.38 + 2.47.
6.Calculate 12.00 − 8.657, then round the result to two decimal places.
7.Work out 3.25 × 6.
8.Work out 8.4 ÷ 4.
9.Match each decimal calculation to its answer.
- 1.25 + 0.75
- 3.6 ÷ 6
- 0.4 × 0.9
- 5.2 − 3.7
- 2
- 0.6
- 1.5
- 0.36
10.A walking track is 9.45 km long. Maia walks 3.8 km in the morning and 2.675 km in the afternoon. How many kilometres does she still need to walk to complete the track?
Estimate and check
11.Round 6.72 and 2.38 to the nearest whole number. Use the rounded values to estimate (6.72 + 2.38) × 3.
12.Find the exact value of (6.72 + 2.38) × 3.
13.Compare the estimate of 27 with the exact answer of 27.3. Is the estimate an overestimate or an underestimate?
3 printable pages
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Page 2
Page 3
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