Basic Math & Pre-Algebra All-in-One For Dummies (+ Chapter Quizzes Online)
Explore Book Buy On AmazonSample question
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Find 7 + –3 – 6 – (–10).
8. Start at the left with the first two numbers, 7 + –3 = 4:
7 + –3– 6 – (–10) = 4 – 6 – (–10)
Continue with the next two numbers, 4 – 6 = –2:
4 – 6– (–10) = –2– (–10)
Finish up with the last two numbers, remembering that subtracting a negative number is the same thing as adding a positive number:
–2 – (–10) = –2 + 10 = 8
Practice questions
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What’s 9 – 3 + 8 – 7?
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Evaluate 11 – 5 – 2 + 6 – 12.
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Find 17 – 11 – (–4) + –10 – 8.
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–7 + –3 – (–11) + 8 – 10 + –20 = ?
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9 – 3 + 8 – 7 = 7.
Add and subtract from left to right:
9 – 3 + 8 – 7
= 6 + 8 – 7
= 14 – 7 = 7
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11 – 5 – 2 + 6 – 12 = –2.
11 – 5 – 2 + 6 – 12
= 6 – 2 + 6 – 12
= 4 + 6 – 12
= 10 – 12 = –2
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17 – 11 – (–4) + –10 – 8 = –8.
17 – 11 – (–4) + –10 – 8
= 6 – (–4) + –10 – 8
= 10 + –10 – 8
= 0 – 8 = –8
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–7 + –3 – (–11) + 8 – 10 + –20 = –21.
–7 + –3 – (–11) + 8 – 10 + –20
= –10 – (–11) + 8 – 10 + –20
= 1 + 8 – 10 + –20
= 9 – 10 + –20
= –1 + –20 = –21