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 numbers together. | ||
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| + | Imagine that we are adding 205 to 876. | ||
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| + | *Firstly, write the two 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. | ||
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| + | *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. | ||
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[[Image:Picture8ol0.png]] | [[Image:Picture8ol0.png]] | ||
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| + | [[Category:Mathematics]] | ||
Revision as of 22:28, November 4, 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 two 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.
