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When we multiply by 109 this means we are multiplying by 10 nine times. This has the effect of moving the decimal point 9 places to the right.

So, if we move the decimal 2 places we get 156 and then if we move it 7 places more this is the same as adding 7 zeroes to the end of the number.

Thus the answer is 1,560,000,000 (1 billion & 560 million)

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12y ago
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Q: How is 1.56 x 10 to the 9th power written in decimal notation?
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