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17 August, 17:51

When Tom found found the difference - 11 - (-4) he got an answer of - 15. What might Tom have done wrong?

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Answers (2)
  1. 17 August, 18:00
    0
    Tom combined like terms as if it were an equation instead of solving the problem. - 11 - (-4) would turn into a - 11+4 and to solve that do 11-4=7 but the 7 is negative because the bigger number in that problem (11) was negative. - 11 - (-4) = -7
  2. 17 August, 18:14
    0
    Tom apparently added - 4 to - 11 instead of subtracting it.
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