If you have an integer, add a zero at the end. For example, 5 x 10 = 50, 123 x 10 = 1230.
More generally, to multiply by 10, you move the decimal point one position to the right. The decimal point can be implied; in the first example above, 5 is the same as 5.0, and 50 is the same as 50.0. However, this rule also allows you to easily multiply numbers with decimals by 10, for example, 2.24 x 10 = 22.4, or 1.5 x 10 = 15.
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Multiply by 10
When you multiply by 10, you add one more zero. 10^10 x 10^1 = 10^11
To find the number you need to multiply by 3 to get 10, you would divide 10 by 3. The result is approximately 3.333. This means that when you multiply 3 by approximately 3.333, you will get very close to 10.