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The Basic Skills<br />
<strong>Simply</strong> <strong>Math</strong> Booklet<br />
4. Subtract the ones column: 10 – 8 = 2.<br />
Now subtract the tens column: 9 – 4 = 5<br />
Now subtract the hundreds column: 8 – 5 = 3<br />
5. 900 – 548 = 352<br />
Remember: Follow the same steps for any subtraction problem.<br />
To check subtraction problems you can add the answer to the number you<br />
subtracted and you should get the other number.<br />
For example: 352 + 548 = 900<br />
Estimating Differences<br />
We use the same method for estimating differences as we do for adding sums.<br />
Round each number and then subtract the rounded numbers. This probably<br />
won't be the exact answer but it may be close enough for some purposes.<br />
How to estimate a difference by rounding.<br />
1. Round each term that will be subtracted.<br />
2. Subtract the rounded numbers.<br />
For example: Estimate 855 – 385<br />
1. Round each term. 900 – 400<br />
2. Subtract. 500<br />
3. Actual answer: 470<br />
14<br />
14<br />
<strong>Simply</strong> <strong>Math</strong> Workbook<br />
NWT Literacy Council
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