4.3 4.3 Subtraction with negative numbers ●●
I can carry out subtractions involving negative numbers
Subtracting a negative number is the same as adding an appropriate positive number. Develop fluency a 12 – (–15) b 23 – (–17) a 12 – (–15) = 12 + 15 = 27 b 23 – (–17) = 23 + 17 = 40 1 Use a number line to work these out. 4 – (–1) c 7 – (–4) d 6 – (–8) a 2 – (–5) b
ia l
2 Use a number line to work these out. –5 – (–3) c –6 – (–5) d –7 – (–3) a –3 – (–4) b
er
3 Without using a number line, write down the answers. 3 – (–2) c 3 – (–8) d 6 – (–)7 a 2 – (–5) b
m at
4 Without using a number line, write down the answers. –2 – (–3) c –4 – (–7) d –8 – (–9) a –1 – (–6) b 5 Use a number line to work these out. 6 – (–1) – 7 c 8 – (–4) – 5 a 8 – (–5) – 3 b
pl e
6 Use a number line to work these out. –2 – (–3) + 4 c –9 – (–5) + 3 a –1 – (–3) + 5 b
m
7 Use a number line to work these out. 5 – (–3) – (–1) c 4 – (–6) – (–7) a 9 – (–2) – (–4) b
sa
8 Use a number line to work these out. –11 – (–4) – (–2) c –8 – (–3) – (–4) a –2 – (–4) – (–3) b 9 Without using a number line, write down the answers. a 1 – (–5) – 4 b 2 – (–7) – 3 c 3 – (–9) – 2 10 Without using a number line, write down the answers. –6 – (–8) – (–4) c –8 – (–2) – (–5) a –3 – (–1) – (–5) b
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