isa01 isa01
  • 21-02-2017
  • Mathematics
contestada

Why can you use addition to check your substraction

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derpysnailcat
derpysnailcat derpysnailcat
  • 21-02-2017
If you do 7-5 then you get 2. You can check by adding 2+5 to get 7. You do this because this is how you check your work . 
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tyana3
tyana3 tyana3
  • 21-02-2017
They are both the inverse of each other, same as multiplying and dividing.
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