4.3 4.3 Subtraction with negative numbers ●
I can carry out subtractions involving negative numbers
Develop fluency Subtracting a negative number is the same as adding an appropriate positive number.
Worked example a 12 – (–15) a 12 – (–15) = 12 + 15 = 27
b 23 – (–17) b 23 – (–17) = 23 + 17 = 40
1 Use a number line to work these out. a 2 – (–5) b 4 – (–1)
c 7 – (–4)
d 6 – (–8)
t n e t n its o c d e e l o p t t m c Sa bje u S
2 Use a number line to work these out. a –3 – (–4) b –5 – (–3)
c –6 – (–5)
d –7 – (–3)
3 Without using a number line, write down the answers. a 2 – (–5) b 3 – (–2) c 3 – (–8)
d 6 – (–)7
4 Without using a number line, write down the answers. a –1 – (–6) b –2 – (–3) c –4 – (–7)
d –8 – (–9)
5 Use a number line to work these out. a 8 – (–5) – 3 b 6 – (–1) – 7
c 8 – (–4) – 5
6 Use a number line to work these out. a –1 – (–3) + 5 b –2 – (–3) + 4
c –9 – (–5) + 3
7 Use a number line to work these out. a 9 – (–2) – (–4) b 5 – (–3) – (–1)
c 4 – (–6) – (–7)
8 Use a number line to work these out. a –2 – (–4) – (–3) b –11 – (–4) – (–2)
c –8 – (–3) – (–4)
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. a –3 – (–1) – (–5) b –6 – (–8) – (–4) c –8 – (–2) – (–5)
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