Finally, suppose you have gotten the first five problems incorrect. If you miss the next three problems, you move even further away from zero; you would now need to get five correct to bring the first five problems up to zero plus another three correct to bring the next three problems up to zero. In other words, you would need to get 8 more correct to bring your score up to zero: –5 – 3 = –8. To subtract a positive number from a negative number, add the two numbers. The sum will be negative.
Examples
–30 – 15 = –45
– 18 – 7 = –25 – 500 – 81 = –581
Practice
1. –16 – 4 =
2. –70 – 19 =
3. –35 – 5 =
4. –100 – 8 =
5. –99 – 1 =
Solutions
1. –16 – 4 =
–20
2. –70 – 19 =
–89
3. –35 – 5 =
–40
3. –35 – 5 =
–108
5. –99 – 1 =
–100
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