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The Basic Skills<br />
<strong>Simply</strong> <strong>Math</strong> Booklet<br />
2. Add each column starting from the right, adding the ones first. 6 plus 9 is<br />
15. Put the 5 in the ones column and then carry over the 1 to the next<br />
column.<br />
3. Add the tens column. 5 plus 8 plus 1 is 14. Put the 4 in the tens column and<br />
carry over the one to the next column.<br />
4. Add the hundreds column. 4 plus 2 plus 1 is 7.<br />
5. Your answer is 456<br />
+ 289<br />
745<br />
To check addition problems you can subtract one of the numbers from the sum<br />
or answer and you will get the other number.<br />
Estimating Sums<br />
A quick way to estimate the sum of two numbers is to round each number and<br />
then add the rounded numbers. This probably won't be the exact answer but it<br />
may be close enough for some purposes.<br />
How to estimate a sum by rounding.<br />
1. Round each term that will be added.<br />
2. Add the rounded numbers.<br />
Some uses of rounding are:<br />
• Checking to see if you have enough money to buy what you want.<br />
• Getting a rough idea of the correct answer to a problem<br />
10 10<br />
<strong>Simply</strong> <strong>Math</strong> Workbook<br />
NWT Literacy Council
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