Arithmetic Grade Six
Lesson Twenty-eight: Number Chains
One rule that you should be aware of is that stuff inside of parenthesis
must be computed before stuff without parenthesis. Let's take the following
equation as an example.
As your first step you ought to figure out that 7 + 8 = 15 and then
transform the problem into:
before proceeding. Obviously you could simplify the problem to 36 - ( 7 + 8
) and then to 36 - 15, if you want, but the important thing to remember is
that ( 7 + 8 ) must be solved before the minus sign which proceeds it is
applied.
Here's another example:
Here 32-17 must be solved before doing the rest of the problem. Here's the
problem after this step:
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