Proportions & Percent ChangeCross-multiplication, the percent proportion and percent change.7th GradePROPORTION — two equal ratiosa / b = c / d → a × d = b × c3 / 4 = x / 20 → 3 × 20 = 4x → 60 = 4x → x = 15Set it up with the same quantity on top of both fractions. Units keep you honest.THE PERCENT PROPORTIONpart / whole = % / 100"What is 15% of 80?" → x / 80 = 15 / 100 → x = 12"12 is what percent of 80?" → 12 / 80 = p / 100 → p = 15PERCENT CHANGEchange ÷ original × 100£40 → £52: change is 12, so 12 ÷ 40 × 100 = 30% increase.Shortcut: multiply by (1 ± rate)+30% → × 1.30 · −25% → × 0.75 · 8% tax → × 1.08THE FOUR YOU WILL BE ASKEDTipbill × rate£46 × 0.18 = £8.28Discountprice × (1 − rate)£60 × 0.75 = £45Taxprice × (1 + rate)£25 × 1.07 = £26.75Simple interestI = P × r × t£500 × 0.04 × 3 = £60Proportions & Percent Changelearnposters.com
Proportions & Percent Change — printable math wall chart from LearnPosters. Free vector PDF, US Letter and A4.

Questions about the Proportions & Percent Change poster

Who is the Proportions & Percent Change poster for?
Proportions & Percent Change is filed under 7th Grade (ages 12–13), so it matches what that year asks a child to remember. It is equally useful to an older student revisiting math, and to the parent or teacher answering the question at the kitchen table.
When should you use the Proportions & Percent Change poster?
The summary sheet for the proportion and percent posters in this set. A wall chart earns its place by being glanceable from where the work is happening, so Proportions & Percent Change belongs on the wall where that math work actually happens, within glancing distance, rather than filed away.
What other posters go with Proportions & Percent Change?
Angle Pairs, Area of a Circle and Box Plots sit alongside Proportions & Percent Change in the 7th Grade set. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Angle PairsArea of a CircleBox Plots
Is the Proportions & Percent Change poster free to download and print?
Yes. Proportions & Percent Change downloads as a free PDF with no account, no email and no watermark, like everything else in the 7th Grade set. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
What size does the Proportions & Percent Change poster print at?
Proportions & Percent Change is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Proportions & Percent Change loses nothing.Printing guide

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