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Dividing Decimals

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Dividing Decimals

1. 1. Dividing<br />Decimals<br />
2. 2. 18.5 ÷ 5 =?<br />First, estimate by using compatible numbers…<br /> then set up the problem and divide!<br />
3. 3. What about 37.5 ÷ 1.25?<br />37.5  1.25 looks like it will be close to37  1, which would equal just 37.<br />SO… we will be looking for an answer around 37 and REJECT an answer of300-something or 3-something.<br />
4. 4. 3 7 5<br />1 2 5<br />37.5  1.25<br /><br />To solve this problem using the “paper and pencil” procedure we would set it up like THIS.<br />BUT… the regular division procedure does not work well with decimal divisors… it’s hard to think of how many times 1.25 can go into 37, isn’t it? So, what can we do ?<br />
5. 5. and 37.5  1.25<br /><br />will give the same answer as 3750  125<br />…since we multiplied BOTH Dividend and Divisor by 100.<br />3 7 5<br />1 2 5<br />0 <br />…and we can do this multiplication by moving the decimal point two places to the right !and annexing (or adding) a zero in the ones place.<br />
6. 6. and 3750  125we can solve in the usual way<br />0 <br />3<br />Move the decimal up before you divide!<br />3 7 5<br />1 2 5<br />0 <br />- 3 7 5<br />0 <br />
7. 7. P. 22 #8-26 evens<br />8. <br />