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Example 3.18 from Prealgebra, 3.2 Add Integers
Add Integers: example 3.18
- ⓐ 4 + 2
- ⓑ −3 + 6
- ⓒ 4 + (−5)
- ⓓ -2 + (−3)
Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.
Solution
ⓐ Start with 4 positives. Add two positives. How many do you have? . ⓑ Start with 3 negatives. Add 6 positives. Remove neutral pairs. How many are left? . ⓒ Start with 4 positives. Add 5 negatives. Remove neutral pairs. How many are left? . ⓓ Start with 2 negatives. Add 3 negatives. How many do you have? .
Your turn
The book's Try It right after this example: same idea, new numbers. Only the answer is given.
Model each addition.
- ⓐ 3 + 4
- ⓑ −1 + 4
- ⓒ 4 + (−6)
- ⓓ −2 + (−2)
How did it go?