To multiply any number by 10, simply add a zero. Thus: 235 x 10 = 2350
To divide: 235 ÷ 10 = 23.5 put a decimal point one place to the left.
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multiply centimeters by 10 to get millimeters since 1 cm = 10 mm
Multiply by 3. Then subtract 10.
1 Divide by 1000, multiply by 100
You are doubling whatever you are multiplying.
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.