Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 174 · 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. 1.520 decreased by 15% =
2. 2.480 decreased by 50% =
3. 3.660 decreased by 10% =
4. 4.580 increased by 40% =
5. 5.580 decreased by 35% =
6. 6.240 decreased by 25% =
7. 7.560 decreased by 15% =
8. 8.540 decreased by 75% =
9. 9.170 decreased by 20% =
10. 10.270 increased by 20% =
11. 11.440 increased by 15% =
12. 12.720 decreased by 40% =
13. 13.125 decreased by 8% =
14. 14.96 increased by 25% =
15. 15.750 decreased by 40% =
16. 16.52 decreased by 75% =
17. 17.90 decreased by 10% =
18. 18.50 increased by 12% =
19. 19.80 decreased by 15% =
20. 20.300 increased by 8% =
21. 21.710 decreased by 30% =
22. 22.680 increased by 15% =
23. 23.780 increased by 5% =
24. 24.350 increased by 50% =
25. 25.96 increased by 75% =
26. 26.275 decreased by 12% =
27. 27.484 increased by 75% =
28. 28.80 increased by 20% =
29. 29.400 increased by 20% =
30. 30.40 decreased by 40% =
31. 31.800 decreased by 12% =
32. 32.740 decreased by 5% =
33. 33.640 decreased by 60% =
34. 34.350 decreased by 8% =
35. 35.745 decreased by 60% =
36. 36.60 increased by 15% =
37. 37.780 decreased by 10% =
38. 38.225 decreased by 8% =
39. 39.570 increased by 10% =
40. 40.712 increased by 75% =

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