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Decimal Operations Practice

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Decimal Operations Practice

Estimate where asked, then show your calculations. Use NZ dollars for money questions.

Estimate and Calculate

1.Estimate by rounding each number to the nearest whole number, then calculate 16.738 + 8.65.

2.Estimate by rounding each number to the nearest whole number, then calculate 42.31 − 17.586.

3.Round 5.38 to the nearest whole number for an estimate, then calculate 5.38 × 7.

4.Round 2.846 to the nearest whole number for an estimate, then calculate 2.846 × 9.

Decimal Operations in Context

5.Anahera buys 4 notebooks for $3.25 each and a pen for $2.40. What is the total cost?

6.One batch of smoothie needs 1.625 litres of juice. How many litres are needed for 6 batches?

7.Matiu cycled 8.45 km on Saturday and 6.78 km on Sunday. How much farther did he cycle on Saturday?

Challenge

8.Calculate 18.457 + 6.89 + 4.726, then round the total to two decimal places.

9.Calculate 7.248 × 5, then round the product to two decimal places.

10.Which calculation has the greatest result? Choose one and show or explain your comparison.

5.6 × 5
16.2 + 13.45
38.7 − 7.925

11.A fabric shop charges $14.60 per metre. Estimate the change from $60 when Hana buys 2.4 metres. Round $14.60 to $15 and 2.4 to 2 for your estimate.