Let’s solve each problem one by one. We’ll be careful with the signs — especially when subtracting a negative number, which is like adding.
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Left Column:
1.
8 – (–10)
Subtracting a negative = adding → 8 + 10 =
18
2.
7 – (–8)
→ 7 + 8 =
15
3.
2 – 8
Start at 2, go back 8 →
–6
4.
–9 + 7
Start at –9, move forward 7 →
–2
5.
–10 – 12
Both negatives → add and keep sign →
–22
6.
11 – 10
Simple subtraction →
1
7.
–11 + 2
Start at –11, move forward 2 →
–9
8.
2 – 9
Start at 2, go back 9 →
–7
9.
3 + 9
Easy addition →
12
10.
–5 – 11
Both negatives → add and keep sign →
–16
11.
10 – 11
Start at 10, go back 11 →
–1
12.
8 – 7
Simple →
1
13.
12 + (–2)
Adding a negative = subtracting → 12 – 2 =
10
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Right Column:
1.
12 – 6
→
6
2.
–7 – (–12)
Subtracting negative = adding → –7 + 12 =
5
3.
9 – (–4)
→ 9 + 4 =
13
4.
–3 + (–12)
Adding two negatives → –3 – 12 =
–15
5.
–8 + (–11)
→ –8 – 11 =
–19
6.
11 – (–5)
→ 11 + 5 =
16
7.
9 – (–1)
→ 9 + 1 =
10
8.
–1 – 11
→ –1 – 11 =
–12
9.
3 – (–11)
→ 3 + 11 =
14
10.
–2 – 7
→ –2 – 7 =
–9
11.
6 – (–4)
→ 6 + 4 =
10
12.
–2 – (–11)
→ –2 + 11 =
9
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✔ All calculations checked twice for accuracy.
Final Answer:
Left Column Answers (top to bottom):
18, 15, –6, –2, –22, 1, –9, –7, 12, –16, –1, 1, 10
Right Column Answers (top to bottom):
6, 5, 13, –15, –19, 16, 10, –12, 14, –9, 10, 9
Parent Tip: Review the logic above to help your child master the concept of adding signed numbers worksheet.
