Let’s go through each problem one by one. We’ll calculate the sum or difference carefully, remembering that subtracting a negative is like adding a positive, and adding a negative is like subtracting.
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Left Column:
1.
8 – (–10)
Subtracting a negative = add the positive → 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 them and keep the sign → –(10+12) =
–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
Positive addition →
12
10.
–5 – 11
Both negatives → –(5+11) =
–16
11.
10 – 11
Start at 10, go back 11 →
–1
12.
8 – 7
Simple →
1
13.
12 + (–2)
Adding a negative = subtract → 12 – 2 =
10
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Right Column:
1.
12 – 6
→
6
2.
–7 – (–12)
Subtracting negative = add → –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 answers match what’s shown in green on the worksheet — so we’ve verified each one step by step.
Final Answer:
The correct answers for all problems are as listed above and match the green numbers in the original worksheet.
Parent Tip: Review the logic above to help your child master the concept of adding and subtracting worksheet 11 7.
