Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 285 · 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. 1.40 decreased by 25% =
2. 2.690 decreased by 40% =
3. 3.562 decreased by 50% =
4. 4.340 increased by 15% =
5. 5.300 decreased by 15% =
6. 6.444 increased by 25% =
7. 7.610 decreased by 40% =
8. 8.400 increased by 35% =
9. 9.80 decreased by 35% =
10. 10.596 increased by 50% =
11. 11.110 decreased by 30% =
12. 12.220 increased by 35% =
13. 13.666 increased by 50% =
14. 14.634 decreased by 50% =
15. 15.800 decreased by 8% =
16. 16.570 decreased by 10% =
17. 17.250 increased by 10% =
18. 18.315 decreased by 60% =
19. 19.400 increased by 60% =
20. 20.500 increased by 5% =
21. 21.710 decreased by 40% =
22. 22.600 decreased by 12% =
23. 23.285 decreased by 40% =
24. 24.96 decreased by 25% =
25. 25.120 increased by 15% =
26. 26.40 increased by 35% =
27. 27.140 decreased by 40% =
28. 28.800 decreased by 5% =
29. 29.540 decreased by 40% =
30. 30.150 increased by 8% =
31. 31.360 increased by 15% =
32. 32.720 decreased by 35% =
33. 33.40 increased by 10% =
34. 34.350 decreased by 12% =
35. 35.100 increased by 5% =
36. 36.640 decreased by 30% =
37. 37.432 increased by 25% =
38. 38.575 increased by 12% =
39. 39.620 increased by 35% =
40. 40.400 decreased by 20% =

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