Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 159 · 40 questions

The fast method (One-step multiplier): Increase by p%: multiply by (100 + p)% — up 20% is × 1.2. Decrease by p%: multiply by (100 − p)% — down 25% is × 0.75. Easy way to multiply: × the whole number (115 or 75), then ÷ 100.

1. 1.615 decreased by 20% =
2. 2.700 increased by 15% =
3. 3.196 increased by 25% =
4. 4.660 decreased by 15% =
5. 5.120 decreased by 10% =
6. 6.100 increased by 30% =
7. 7.375 decreased by 12% =
8. 8.690 increased by 10% =
9. 9.360 increased by 35% =
10. 10.600 increased by 15% =
11. 11.80 decreased by 50% =
12. 12.188 increased by 25% =
13. 13.295 increased by 60% =
14. 14.780 decreased by 60% =
15. 15.768 decreased by 25% =
16. 16.160 decreased by 40% =
17. 17.86 decreased by 50% =
18. 18.680 increased by 30% =
19. 19.340 decreased by 15% =
20. 20.60 decreased by 15% =
21. 21.705 decreased by 60% =
22. 22.380 increased by 40% =
23. 23.320 decreased by 15% =
24. 24.244 decreased by 25% =
25. 25.440 decreased by 15% =
26. 26.570 increased by 20% =
27. 27.620 increased by 50% =
28. 28.435 increased by 40% =
29. 29.776 decreased by 75% =
30. 30.50 decreased by 8% =
31. 31.350 increased by 8% =
32. 32.80 decreased by 15% =
33. 33.680 decreased by 10% =
34. 34.540 decreased by 5% =
35. 35.60 decreased by 35% =
36. 36.620 increased by 35% =
37. 37.760 decreased by 35% =
38. 38.100 increased by 15% =
39. 39.735 decreased by 60% =
40. 40.240 decreased by 35% =

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