Unit 4 - FractionS Flashcards
What is another word for cancelling down?
Simplifying
How do your simplify a fraction?
Find the highest common multiplier.
Divide top and bottom by that number.
How do you change a mixed number to a fraction?
Mixed number x bottom.
Product + top.
How do you multiply two fractions together?
Multiply tops
Multiply bottoms.
How do you divide two fractions?
Second fraction upside down.
Multiply across.
How do you add two fractions together?
Multiply bottoms.
Cross cross
Add tops.
How do you subtract to fractions?
Multiply bottoms.
Cross cross
Take away tops.
How do find the fraction of something?
Multiply number by top.
Divide number by bottoms.
How do you write a ratio as a fraction?
Just have the divide sign to a colon.
2/9 = 2:9
How do you simplify ratios?
Divide them both by the same number.
How do you work with ratios of different units?
Multiply or divide until they have the same units.
How do you get the ratio into 1:n or n:1?
Divide left to right or right to left.
What is direct proportion?
When one number is multiplied, Theo there is multiplied by the same number.
How do you find the ratio of something?
Add ratios.
Divide whole number by ratio total.
Multiply this by each value.
Add to check.
How do you find x% of y?
Number x percentage over 100.
How do you increase by an amount?
Multiply by 1 + percentage.
(90% = 1.90).
How do decrease by an amount?
Multiply by 100 - percentage in a decimal.
( 90% = 0.10 ).
How do you express x as a percentage of y?
Divide x by y then multiply by 100.
How do you find the percentage change?
CHANGE divided by original x 100.
How do you find the original value?
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- Write amount as a percentage of the original value.
- Divide to find 1%.
- Multiply by 100.
How do you go from a percentage to a fraction?
Percentage over 100.
Simplify.
How do you get a fraction to a percentage?
Convert fraction to over 100.
OR
Numerator divided by denominator x 100.
How do go from percentage to a decimal?
Divide by 100.
How do you get a decimal to a percentage?
X 100.
How do you get a decimal to a fraction?
Put decimal over 100.
Simplify down.
How do you get a fraction to a decimal?
Denominator to 10, 100 or 100.
OR
NUMERATOR DIVIDE BY DENOMINATOR.
How do you convert recurring decimal to a fraction?
- Multiply by either 10, 100 or 1000.
- New decimal take old decimal.
- Take one from multiplier.
- Divide new number by remaining multiplier.
