Difference between revisions of "Long addition"
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(method can be used for any amount of numbers) |
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Imagine that we are adding 205 to 876. | Imagine that we are adding 205 to 876. | ||
| − | *Firstly, write the | + | *Firstly, write the numbers above each other - make sure that you write units first, then tens, then hundreds, and so on. Writing from right to left helps here. |
*Then, it is as simple as adding the columns, again, from right to left. If you get a number that it ten or greater - in our example, adding 5 and 6 gives 11 - then right the first digit under the column one 'space' to the left. This then becomes part of the column of numbers that you add. If there is nothing in a column, treat it as 0 - when adding the 8 and 2 in the hundreds column, for example, we get a 1 that is then carried over into the empty thousands column. It is the only entry there, so we drop it down to the answer box. | *Then, it is as simple as adding the columns, again, from right to left. If you get a number that it ten or greater - in our example, adding 5 and 6 gives 11 - then right the first digit under the column one 'space' to the left. This then becomes part of the column of numbers that you add. If there is nothing in a column, treat it as 0 - when adding the 8 and 2 in the hundreds column, for example, we get a 1 that is then carried over into the empty thousands column. It is the only entry there, so we drop it down to the answer box. | ||
Revision as of 21:34, November 11, 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 you write units first, then tens, then hundreds, and so on. Writing from right to left helps here.
- Then, it is as simple as adding the columns, again, from right to left. If you get a number that it ten or greater - in our example, adding 5 and 6 gives 11 - then right the first digit under the column one 'space' to the left. This then becomes part of the column of numbers that you add. If there is nothing in a column, treat it as 0 - when adding the 8 and 2 in the hundreds column, for example, we get a 1 that is then carried over into the empty thousands column. It is the only entry there, so we drop it down to the answer box.
