Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 68 · 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. 1.440 increased by 15% =
2. 2.65 increased by 20% =
3. 3.680 decreased by 5% =
4. 4.480 decreased by 10% =
5. 5.620 decreased by 25% =
6. 6.620 increased by 75% =
7. 7.80 decreased by 5% =
8. 8.400 decreased by 60% =
9. 9.310 decreased by 10% =
10. 10.775 decreased by 8% =
11. 11.680 decreased by 60% =
12. 12.680 decreased by 20% =
13. 13.100 decreased by 20% =
14. 14.240 increased by 75% =
15. 15.355 increased by 60% =
16. 16.60 decreased by 15% =
17. 17.400 decreased by 60% =
18. 18.280 decreased by 15% =
19. 19.605 increased by 60% =
20. 20.655 decreased by 60% =
21. 21.720 decreased by 30% =
22. 22.460 increased by 5% =
23. 23.220 decreased by 20% =
24. 24.60 decreased by 35% =
25. 25.550 decreased by 40% =
26. 26.388 decreased by 50% =
27. 27.90 increased by 60% =
28. 28.512 increased by 25% =
29. 29.310 increased by 50% =
30. 30.50 decreased by 50% =
31. 31.780 increased by 15% =
32. 32.200 increased by 5% =
33. 33.80 decreased by 15% =
34. 34.285 decreased by 40% =
35. 35.640 increased by 15% =
36. 36.615 decreased by 20% =
37. 37.132 increased by 75% =
38. 38.75 increased by 20% =
39. 39.376 decreased by 50% =
40. 40.230 increased by 30% =

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