Dividing a decimal number by another decimal number can be done by multiplying both the dividend and divisor by powers of 10 to clear the decimals. This allows using standard long division procedures. The document demonstrates converting 37.5 / 1.25 to 375 / 12.5 by moving the decimal point one place right in both numbers. It then shows converting this to 3750 / 125 by another place to the right to allow long division to be used.
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4. FIRST … Come up with a QUICK ESTIMATE … 37.5 1.25 looks like it will be close to 37 1 , which would equal just 37. SO… we will be looking for an answer around 37 and REJECT an answer of 300-something or 3-something.
5. 37.5 1.25 To solve this problem using the “paper and pencil” procedure we would set it up like THIS. BUT… the regular division procedure does not work comfortably with decimal divisors… what can we do ? 3 7 5 1 2 5
6. 37.5 1.25 will give the same answer as 375 12.5 ...since we multiplied BOTH Dividend and Divisor by 10. … and we can do this multiplication by moving the decimal point one place to the right ! 3 7 5 1 2 5
7. and 375 12.5 0 will give the same answer as 3750 125 … since we multiplied BOTH Dividend and Divisor by 10 again . … and we can do this multiplication by moving the decimal point one more place to the right ! and annexing a zero in the ones place. 3 7 5 1 2 5
8. and 3750 125 we can solve in the usual way 3 7 5 1 2 5 0 3 - 3 7 5 0 0