fractions, decimals and percentages notes

fractions

cancelling down

• divide top and bottom by the same number

multiplying

• multiply top and bottom separately

dividing

• turn second fraction upside down and then multiply

common denominators

• times denominators together
• times numerators by opposite denominators

adding and subtracting

• make sure the denominators are the same
• add or subtract the top lines only

finding a fraction of something

• multiply the something by the top of the fraction and divide it by the bottom

fractions, decimals and percentages

• 1/2, 0.5, 50%
• 1/4, 0.25, 25%
• 3/4, 0.75, 75%
• 1/3, 0.33.., 33.33%
• 2/3, 0.66.., 66.66%
• 1/10, 0.1, 10%
• 1/5, 0.2, 20%
• 2/5, 0.4, 40%
• fraction to decimal= divide
• decimal to percentage= x by 100
• percentage to decimal= divide by 100
• terminating decimals to fractions- digits after decimal point on top, power of ten on bottom with the same number of 0's as there were decimal places

fractions and recurring decimals

recurring decimals into fractions

basic ones

• name your decimal
• multiply it by a power of ten to move it past the decimal point by…