Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 1 · 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. 1.420 increased by 30% =
2. 2.500 decreased by 35% =
3. 3.312 increased by 75% =
4. 4.75 decreased by 8% =
5. 5.382 increased by 50% =
6. 6.540 increased by 15% =
7. 7.760 decreased by 15% =
8. 8.85 increased by 20% =
9. 9.708 decreased by 75% =
10. 10.740 increased by 15% =
11. 11.590 increased by 50% =
12. 12.528 decreased by 25% =
13. 13.320 decreased by 40% =
14. 14.100 increased by 35% =
15. 15.390 increased by 40% =
16. 16.260 decreased by 5% =
17. 17.175 decreased by 8% =
18. 18.675 decreased by 12% =
19. 19.140 increased by 5% =
20. 20.145 decreased by 60% =
21. 21.148 decreased by 75% =
22. 22.300 decreased by 15% =
23. 23.365 increased by 60% =
24. 24.648 decreased by 25% =
25. 25.510 increased by 40% =
26. 26.800 increased by 5% =
27. 27.710 increased by 20% =
28. 28.68 increased by 75% =
29. 29.56 increased by 25% =
30. 30.674 decreased by 50% =
31. 31.540 decreased by 35% =
32. 32.760 increased by 30% =
33. 33.325 decreased by 12% =
34. 34.570 increased by 40% =
35. 35.50 increased by 12% =
36. 36.260 decreased by 30% =
37. 37.750 decreased by 8% =
38. 38.140 increased by 60% =
39. 39.725 increased by 8% =
40. 40.450 decreased by 10% =

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