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Ratios (4.2 Simplifying Ratios (E.g. 2 cm: 4 mm (Find a common unit (= 20…
Ratios
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4.6 Sharing a Ratio
To share a ratio, add the numbers in the ratio together, then divide them by the number you have to share it into. Then multiply the numbers in the ratio by the answer of the previous step.
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4.7 Rates
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To calculate the average speed based off a rate, change the rate into a unit ratio. 
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4.5 Scale Drawings
Picture:Real life
In maps and drawings, it is hard to draw the item to scale (the size it is in real life). Because of this, you need a scale.
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