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because when you multiply by 2 you are just doubling the number being multiplied by two.

example: 5x2=10 5+5=10

Q: How does adding doubles help you multiply by two?

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Doubling is the same as multiplying by two. The two actions are the same.

-4

The circumference also doubles.

Multiplying by two is the same thing as adding the number to itsself again. 2 (4) = 4 + 4

Because, if you want to multiply say 2*4=8 that is the same as doing 4+4=8 or 4 two times. It's the same with all numbers!

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Doubling is the same as multiplying by two. The two actions are the same.

Anything times two equals the thing added to itself. 33 x 2 = 33 + 33

you multiply 5 by 2 which is ten or you think of adding 5 two's or adding 2 fives.

-4

The circumference also doubles.

Multiplying by two is the same thing as adding the number to itsself again. 2 (4) = 4 + 4

It will help when you are adding and subtracting fractions.

Because, if you want to multiply say 2*4=8 that is the same as doing 4+4=8 or 4 two times. It's the same with all numbers!

-100

Multiply it by 2 as for example 3+3 = 6 which is the same as 2*3 = 6

For dividing they spelled it out for example, two-sevenths was "duae septimae" and three-eighths was "tres octavae." For multiplying they put horizontal a dash or line over the numeral and multiply by a thousand ...... I believed there was nor subtracting or adding just adding on or taking off numerals.

if you mean adding two percents to each other just move the decimal point on both two places to the right, then add them together and multiply the sum by 100