Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 294 · 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. 1.590 decreased by 50% =
2. 2.800 decreased by 35% =
3. 3.745 decreased by 60% =
4. 4.550 increased by 40% =
5. 5.360 increased by 15% =
6. 6.500 decreased by 5% =
7. 7.600 decreased by 40% =
8. 8.668 decreased by 75% =
9. 9.475 decreased by 12% =
10. 10.100 decreased by 5% =
11. 11.325 decreased by 8% =
12. 12.460 decreased by 40% =
13. 13.440 increased by 10% =
14. 14.350 increased by 8% =
15. 15.140 decreased by 5% =
16. 16.290 increased by 40% =
17. 17.700 increased by 5% =
18. 18.420 decreased by 10% =
19. 19.290 decreased by 10% =
20. 20.640 increased by 5% =
21. 21.400 increased by 5% =
22. 22.480 increased by 30% =
23. 23.332 increased by 75% =
24. 24.142 decreased by 50% =
25. 25.608 increased by 25% =
26. 26.110 increased by 10% =
27. 27.580 decreased by 5% =
28. 28.96 increased by 75% =
29. 29.100 increased by 20% =
30. 30.255 decreased by 20% =
31. 31.590 decreased by 60% =
32. 32.460 decreased by 15% =
33. 33.172 increased by 75% =
34. 34.290 increased by 10% =
35. 35.350 decreased by 12% =
36. 36.748 decreased by 50% =
37. 37.200 decreased by 40% =
38. 38.720 increased by 10% =
39. 39.252 decreased by 75% =
40. 40.160 increased by 5% =

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