Difference between revisions of "Long addition"
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| − | '''Long addition''' is a simple, fairly long winded, but highly useful method of adding multi-digit | + | '''Long addition''' is a simple, fairly long winded, but highly useful method of adding multi-digit [[number]]s together. |
Imagine that we are adding 205 to 876. | Imagine that we are adding 205 to 876. | ||
Latest revision as of 02:43, November 25, 2008
Long addition is a simple, fairly long winded, but highly useful method of adding multi-digit numbers together.
Imagine that we are adding 205 to 876.
- Firstly, write the numbers above each other. Make sure that the digits of both numbers are clearly aligned according to their place values (i.e. hundreds, tens and units). Leaving a definite space between your columns helps avoid confusion, especially with larger sums.
- Then, it is as simple as adding the columns. Begin in the units column and work from right to left.
- In our example, adding 5 and 6 gives 11. 11 can be thought of as 1 ten and 1 unit. The unit is recorded in the answer box in the units column. The ten must be "carried" into the tens column, so the next operation is 7 + 0 + 1 = 8. The eight is recorded in the answer box in the tens column.[1]
- Finally, we add the digits in the hundreds column (8 + 2 = 10).[2] The zero is recorded in the answer box in the hundreds column, and the one is placed in the answer box in a new thousands column.
