Answers to mental math problems

From KNILT
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  • Let's use some mental math! Solve the following problems using mental math...
    • 1. -8 + -9= -17
    • 2. -15 + -6= -21
    • 3. 50 + 36= 86
    • 4. -200 + -50= -250

Back to adding integers with the same sign using models

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