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Example 3: Subtract 136 L 540 mL from 200 L.

Solution: Arrange the given measures in the columns of L and mL and then subtract.

Step 1: Subtract millilitres.

540 mL cannot be subtract from 0 mL. L mL
9 9 9
So, we regroup litre and millilitre. 1 10 10 10 10

We can write 200 L as 199 L and 1000 mL 2 0 0 0 0 0
Now, 1000 mL – 540 mL = 460 mL – 1 3 6 5 4 0

Write 460 under the mL column. 6 3 4 6 0

Step 2: Subtract litres.

199 L – 136 L = 63 L

Write 63 under the L column.

Thus, 200 L – 136 L 540 mL = 63 L 460 mL

Practice time 9e

1. Subtract.

(a) km m (b) m cm (c) kg g

2 8 3 0 0 8 6 4 0 6 9 6 4 6 2
– 1 4 2 1 6 – 3 4 5 0 4 – 4 6 2 0 8

(d) kg g (e) L mL (f) L mL

2 1 6 0 6 5 7 9 0 6 8 3 2 1 4 5 0

– 1 9 0 0 9 0 – 5 1 0 4 6 – 9 9 3 4 5

2. Arrange the following in the columns and then subtract. Use the conversion method

where needed.

(a) 128 m 76 cm from 949 m 6 cm (b) 78 cm from 4 m

(c) 156 m 16 cm from 600 m (d) 20 km 855 m from 36 km 44 m

(e) 55 kg 930 g from 67 kg 324 g (f) 750 kg 600 g from 944 kg 177 g

(g) 103 L 995 mL from 200 L (h) 16 L 250 mL from 50 L 50 mL

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