MATH - PERCENTAGES & EQUATIONS

how to increase by a percent

put the % over 100 x price ASK multiply or add answer by price

how to find the percent of a number

put the percent over 100 and multiply by full number

how to decrease a percentage

put the percent over 100 x full number. subtract answer from full number

how to find 100% of a quanity

write what the percent equals divide price by percent multiply answer by 100

64 - 5%

5 r 100 x 64 = = - 64

53% of $400

53 r 100 x 400 = $212

increase 84 by 6%

6 r 100 x 84 = 5.04 5.04 x 84 = 423.36

bananas are 20c each. he sells them at increase of 160%, what is the new selling price?

160 r 100 x 0.2 = 32c

2x + 5 = 7 2 step equation

2x + 5 = 7 -5 -5 - 2 2x = 2 /2 /2 - 1 x = 1

find 100% if 62% is $264.12

62% = $264.12 264.12/62 = 4.26 (1%) 4.26 x 100 = $426

calculate gst of DVD listed at $89 (excluding GST) UNITARY

89/110 = (1%) multiply the answer by 10 which gives the GST

55 r 250 x 100 = 22%

express the percentage - write 55g as a percentage 250g

unitary method

given amount divided by 110% (GST) = 1% multiply by 10% (=GST)

how to do a two step equation

lowest number reversed by itself same for other one

how to find a change

put amount of change over original value x 100

how to express a percentage

put number of over 100 and x by full number