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Subtraction

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Subtraction
an operation of finding an addend by a sum and another addend: 17 6 = 11. Here 17 is a minuend, 6 a subtrahend, 11 the difference.

Math tricks 1:

subtracting by oversubtracting

251-85

=(151+100)-85

=151+100-85

=151+15

=166

In this example,251 is break into 151 and 100

Math tricks 2:

subtracting by adding to each number

251-85

=(151+100)-85

=151+100-85

=151+15

=166

In this example,251 is break into 151 and 100

Math tricks 3:

subtracting by subtracting to each number

831-104

=(831-4)-(104-4)

=827-100

=727

In this example,251 is break into 151 and 100


Easy way to check your answer:

Check the answer by working backward

Example:
543
- 295

= 248

Add 248 to 295,and see whether you can get 543 back or not.
248
+ 295

= 543

If the answer(eg.248) add with one of the numbers(eg.295) give you another numbers(eg.543),then your aswer is correct.

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