ratio and proportion notes

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reducing ratios to their simplest form

  • divide all the numbers in the ratio by the same thing
  • it's in its simplest form when there's nothing left you can divide by

if the ratio contain decimals or fractions- multiply

  • with decimals, multiply both sides by a power of 10 to get rid of the decimal parts
  • divide to reduce the ratio to its simplest form
  • with fractions, put them over a common denominator
  • multiply both sides by the denominator
  • divide to reduce the ratio to its simplest form

if the ratio has mixed units- convert to the smaller unit

to get the form 1:n or n:1- divide

scaling up ratios

  • if you know the ratio between parts and the actual size of one…


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