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ToTheMoonNBack

Answer:

20(4 + 5)

Step-by-step explanation:

GCF is just the biggest number each value can be divided by. Here, it's 20, so that goes outside of the parenthesis. Now, what can you multiply by 20 to get 80? 4, so that goes in the second box. What can you multiply by 20 to get 100? 5, so that goes in the last box. You can check your answer by doing 80 + 100 = 180; 20(9) = 180.

So you have to find the GCF (Greatest Common Factor) or 80 and 100, which is 20.

20(?+?)

20 times what gets you 80?

20 times 4 gets you 80.

20 times what gets you 100?

20 times 5 gets you 100.

20(4+5) = 80+100 = 180

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