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How Do You Compare Fractions by Converting to Decimals?
Which fraction is greater, 3/8 or 4/9?
Summary
- Divide the numerator by the denominator to convert a fraction to a decimal
- The numerator, 3, becomes the dividend and the denominator, 8, becomes the divisor
- 3/8 is the same as 0.375
- The numerator, 4, becomes the dividend and the denominator, 9, becomes the divisor
- 4/9 is the same as 0.444...
- The bar means that the 4 repeats
- '<' means 'less than'

Notes
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- It'll be easier to compare the numbers if we rewrite them as decimals
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- The numerator becomes the dividend and the denominator becomes the divisor
- For the first fraction, we divide the numerator, 3, by the denominator, 8
- This gives us a terminating decimal, 0.375, that is equal to 3/8
- For the second fraction, we divide the numerator, 4, by the denominator, 9
- This gives us a repeating decimal, 0.444..., that is equal to 4/9
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- We can graph the decimals on a number line to compare them
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- On a number line, numbers get larger as you move from left to right
- So after we graph our decimals, the decimal on the left will be smaller than the decimal on the right
- 0.375 falls somewhere in between 0.3 and 0.4
- 0.4444... falls somewhere in between 0.4 and 0.5
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- Now that we have both of our decimals plotted on the number line, it'll be easy to see which one is greater!
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- On a number line, numbers get larger as you move from left to right
- Since 0.375 is to the left of 0.444... , we know that 0.375 is less than 0.444...
- '<' means 'less than'