The answer is: "40,000,000" (40 million).
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Explanation:
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(1/10) of a number = (that number divided by 10) ;
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So, write that number:
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" 400,000,000" . That number is 400 million, that is, a "4" following by "eight (8) zeros".
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We can divide this number by "10", by move the decimal place back one place. In this case, the 'implied" decimal place is at the end of the number, so instead of a "4 following by eight (8) zeros" ; or:
400000000; we divide by "10";
by rewriting as a 4 following by "seven (7) zeros":
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4000000.0 ; or: "40,000,000.0; or;
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"40,000,000" (40 million). which is our answer.
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