Answers to the Warm-Up Lesson
1. Evaluate:
- a. - 15 + - 8= -23
- b. 9 - 10= -1
- c. 7 - (-2)= 9
- d. 6 + (-4)= 2
- 2. Writing: How is multiplication and addition related?
Answer: Multiplication is repeated addition. In other words, 2 x 3= 2 + 2 + 2
- 3. Writing: What is the commutative property?
Answer: It states that changing the order of addends or factors does not change the sum or product, respectively. So, 3 + 2= 2+ 3 (Commutative property of addition) or 3 x 2= 2 x 3 (commutative property of multiplication)