Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 474 · 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. 1.620 decreased by 40% =
2. 2.56 decreased by 50% =
3. 3.740 increased by 35% =
4. 4.260 increased by 15% =
5. 5.260 increased by 5% =
6. 6.350 decreased by 30% =
7. 7.540 increased by 30% =
8. 8.250 decreased by 12% =
9. 9.760 increased by 10% =
10. 10.505 increased by 60% =
11. 11.590 decreased by 10% =
12. 12.238 decreased by 50% =
13. 13.550 increased by 10% =
14. 14.664 increased by 75% =
15. 15.756 increased by 75% =
16. 16.500 decreased by 8% =
17. 17.250 decreased by 20% =
18. 18.750 decreased by 20% =
19. 19.140 decreased by 5% =
20. 20.716 increased by 75% =
21. 21.155 increased by 40% =
22. 22.480 decreased by 30% =
23. 23.260 increased by 5% =
24. 24.504 decreased by 25% =
25. 25.390 decreased by 30% =
26. 26.40 decreased by 15% =
27. 27.560 increased by 75% =
28. 28.775 decreased by 12% =
29. 29.50 increased by 20% =
30. 30.570 increased by 20% =
31. 31.200 decreased by 35% =
32. 32.720 increased by 15% =
33. 33.68 increased by 75% =
34. 34.60 increased by 30% =
35. 35.90 decreased by 10% =
36. 36.460 increased by 30% =
37. 37.700 increased by 5% =
38. 38.360 decreased by 35% =
39. 39.720 increased by 10% =
40. 40.100 increased by 8% =

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