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1 November, 03:13

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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  1. 1 November, 03:35
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    Think of an equation:

    200 - 91 = 109

    You can do anything to this equation, as long as you do the same thing to both sides. So, if you add 91 to both sides, you will get:

    200 = 200

    Since this holds true, Susan's strategy to add her answer to 91 makes sense.
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