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172,090=171,090+?
I am confused with my son homework

User Anjie
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2 Answers

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? = 1000
Here's the detail:
172090 = 171090 + 1000
User Sergio Mcfly PYK
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The answer is 1000. 172,090 - 171,090 is 1000 so when you do it backwards and add 1000 to 171,090 you get 172,090. Hope this helps, good luck.
User Face
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