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You work this out using BIDMAS; this tells you the order you need to calculate things in a sum. It stands for

  • Brackets
  • Indices
  • Division
  • Multiplication
  • Addition
  • Subtraction

though addition and subtraction are actually on the same level, as are division and multiplication. While using this as the order in which you work things out, you work from left to right.

If we look at you sum, 15 - 8 X 12,

We see that, as multiplication is before subtraction in BIDMAS, we must first do the multiplication sum. This gives us 15 - 96

Now we minus 96 from 15 which leaves us with -81. This is your answer.

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Q: What does 15 - 8X 12 equal?
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