What’s on the Percent Increase and Decrease poster
The rule, 4 worked examples, and the mistake everyone makes.
- Percent change is the size of the change divided by the ORIGINAL amount, times 100.
- change ÷ original × 100
- £40 → £52 = 30% increase
- £60 → £45 = 25% decrease
- Increase 80 by 15% = 92
- Decrease 80 by 15% = 68
- Common mistake: £40 → £52 is 12/52 → it is 12/40
A 20% rise then a 20% fall does not return you to the start — the second 20% is of a bigger number.
Questions about the Percent Increase and Decrease poster
- What’s on the Percent Increase and Decrease poster?
- The rule, 4 worked examples, and the mistake everyone makes. Percent change is the size of the change divided by the ORIGINAL amount, times 100.; change ÷ original × 100; £40 → £52 = 30% increase; £60 → £45 = 25% decrease; Increase 80 by 15% = 92; Decrease 80 by 15% = 68; Common mistake: £40 → £52 is 12/52 → it is 12/40. A 20% rise then a 20% fall does not return you to the start — the second 20% is of a bigger number.
- Who is the Percent Increase and Decrease poster for?
- Percent Increase and Decrease 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 Percent Increase and Decrease poster?
- Ask what the change is being compared to. That number goes on the bottom. A wall chart earns its place by being glanceable from where the work is happening, so Percent Increase and Decrease belongs on the wall where that math work actually happens, within glancing distance, rather than filed away.
- What other posters go with Percent Increase and Decrease?
- Angle Pairs, Area of a Circle and Box Plots sit alongside Percent Increase and Decrease 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 Percent Increase and Decrease poster free to download and print?
- Yes. Percent Increase and Decrease 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 Percent Increase and Decrease poster print at?
- Percent Increase and Decrease 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 Percent Increase and Decrease loses nothing.Printing guide
Related posters
Charts that sit alongside Percent Increase and Decrease on the same wall.
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