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Multiplying whole numbers by 10

Lindsay finds a pattern from multiplying whole numbers by 10.

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• So 10 to the 6th power would be 10 with 6 zeros?
• 10^6 = 1,000,000 (1 million). Thus, 1 million contains 6 zeroes.
• So if I want to multiply by 100, do I add 2 zeros?
• Yes. For example, If you multiply 9 x 100 it would be 900. You add two zeros when you multiply by 100, one zero when you multiply by 10.
• So 15x10=150
And so 121212x10=1212120
• That's right! To multiply any number by ten, just move the decimal point one place to the right.
• so u just add a zero to the number?
• Yes we can always add a zero, to multiply any whole number by 10.

But when we multiply a decimal by 10, we have to be more careful. For example, 3.5 times 10 is certainly not 3.50, because 3.5 is the same thing as 3.50. If we want to multiply 3.5 by 10, we would need to move the decimal point one place to the right, to get 35.

The idea is that when we multiply any whole number or decimal by 10, we need the place values of the digits to each be multiplied by 10.
• we have bigger numbers to times by ten
not little numbers.
• yes, for example 64,822,772 times ten is 648,227,720
• So 10 to the 6th power would be 10 with six zeros
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