Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 975 · 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. 1.720 decreased by 10% =
2. 2.350 decreased by 60% =
3. 3.345 increased by 20% =
4. 4.180 decreased by 40% =
5. 5.400 increased by 12% =
6. 6.175 decreased by 8% =
7. 7.280 decreased by 10% =
8. 8.790 increased by 20% =
9. 9.400 increased by 12% =
10. 10.552 decreased by 25% =
11. 11.760 increased by 35% =
12. 12.650 decreased by 20% =
13. 13.310 increased by 60% =
14. 14.660 decreased by 35% =
15. 15.120 increased by 75% =
16. 16.700 decreased by 12% =
17. 17.800 decreased by 40% =
18. 18.700 increased by 75% =
19. 19.492 decreased by 75% =
20. 20.725 decreased by 8% =
21. 21.395 decreased by 20% =
22. 22.440 decreased by 25% =
23. 23.545 decreased by 40% =
24. 24.435 decreased by 40% =
25. 25.508 decreased by 50% =
26. 26.520 decreased by 15% =
27. 27.175 decreased by 8% =
28. 28.175 decreased by 8% =
29. 29.564 increased by 75% =
30. 30.450 increased by 20% =
31. 31.90 increased by 20% =
32. 32.78 increased by 50% =
33. 33.80 increased by 35% =
34. 34.250 increased by 12% =
35. 35.620 decreased by 15% =
36. 36.560 decreased by 5% =
37. 37.64 decreased by 50% =
38. 38.180 decreased by 35% =
39. 39.270 decreased by 60% =
40. 40.275 increased by 12% =

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