kantalek
kantalek kantalek
  • 15-02-2017
  • Mathematics
contestada

Susan solved 200-91 and decided o add her answer to 91 to check her work. Explain why this strategy works

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PatDoesGaming33
PatDoesGaming33 PatDoesGaming33
  • 16-02-2017
This strategy works because you would want to make sure that the two numbers add up to the number you subtracted it from. Hope this helped and have an awesome day!
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jimbo6
jimbo6 jimbo6
  • 18-02-2017
109+91=200 it works because of the missing number is now placed in the equation
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