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Decimal Addition Subtraction Methods

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Decimal Addition Subtraction Methods

Use vertical columns or horizontal partitioning to calculate. Keep decimal points aligned, and show working where asked.

Vertical-column method

Set out each calculation vertically. Align the decimal points.

1.Use vertical columns to calculate 34.76 + 18.59.

2.Set out and calculate 96.20 − 47.83 using vertical columns.

3.Calculate 208.45 + 36.78 using the vertical-column method.

4.Work out 125.00 − 68.46. Show the subtraction in vertical columns.

Horizontal method and estimation

Partition numbers or use another mental strategy. Estimate when asked.

5.Calculate horizontally: 63.28 + 24.57.

6.Calculate horizontally: 81.40 − 36.75. Show a step or strategy.

7.Round 63.28 and 24.57 to the nearest whole numbers, then use your rounded numbers to estimate their sum.

8.Which calculation gives a result closest to 50? Choose one.

27.46 + 22.71
81.35 − 29.40
16.82 + 31.96
73.50 − 18.25

9.Match each calculation to its answer.

14.85 + 6.70
42.00 − 11.65
9.38 + 12.17
26.40 − 17.66

21.55
30.35
8.74
21.55

Decimal problems

Write a calculation and include the correct unit in your answer.

10.Hemi buys a notebook for $8.95 and a set of pens for $6.80. What is the total cost?

11.Wire measuring 5.00 metres is cut. One piece is 2.65 metres long. How long is the piece left?

12.A jug contains 1.75 litres of juice. Another 0.85 litres is poured in. Is there enough juice to fill a 2.5-litre container? Calculate the total and explain your answer.