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