Write a repeated addition question for each multiplication , and then solve.
a) 2 x (-9)
b) (4)(8)
c) (3)(-6)
d) (7)(0)
Online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown.
a. 2 * -9 = -9 + -9 = -18
d. 7 * 0 = 0
Use process in a to solve b and c.
a) To create a repeated addition question for 2 x (-9), you can think of it as adding -9 to itself multiple times. So, the repeated addition question is -9 + (-9).
Solving:
-9 + (-9) equals -18.
b) For (4)(8), the repeated addition question is adding 8 to itself four times. So, it can be written as 8 + 8 + 8 + 8.
Solving:
8 + 8 + 8 + 8 equals 32.
c) Similarly, for (3)(-6), the repeated addition question is adding -6 to itself three times. So, it can be written as -6 + (-6) + (-6).
Solving:
-6 + (-6) + (-6) equals -18.
d) For (7)(0), no matter how many times we add 0 to itself, the result will always be 0. So, the repeated addition question is simply 0.
Solving:
0 equals 0.