A usable fraction is a fraction you can use to measure with (i.e., 1/2, 1/4, 1/8, 1/16 inch). You measure with fractions of an inch. However, your calculator works in decimals of an inch. If you want ...
Okay, to make a green dinosaur we use a ratio of 3:7. That’s three yellow dinosaurs for every seven blue. Smashing. To help think about this as a fraction, we need to take a look at them all together.
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