Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 810 · 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. 1.120 decreased by 20% =
2. 2.774 increased by 50% =
3. 3.615 increased by 20% =
4. 4.460 increased by 15% =
5. 5.200 decreased by 8% =
6. 6.165 increased by 40% =
7. 7.125 increased by 12% =
8. 8.300 decreased by 12% =
9. 9.128 increased by 25% =
10. 10.520 increased by 10% =
11. 11.796 increased by 25% =
12. 12.160 decreased by 35% =
13. 13.722 decreased by 50% =
14. 14.470 decreased by 60% =
15. 15.445 increased by 40% =
16. 16.280 increased by 35% =
17. 17.290 decreased by 20% =
18. 18.700 increased by 8% =
19. 19.60 increased by 10% =
20. 20.415 increased by 40% =
21. 21.375 decreased by 8% =
22. 22.790 decreased by 10% =
23. 23.170 decreased by 40% =
24. 24.450 decreased by 40% =
25. 25.185 decreased by 60% =
26. 26.374 increased by 50% =
27. 27.145 increased by 60% =
28. 28.400 decreased by 10% =
29. 29.400 decreased by 35% =
30. 30.620 decreased by 5% =
31. 31.200 increased by 30% =
32. 32.575 decreased by 12% =
33. 33.310 decreased by 60% =
34. 34.148 decreased by 75% =
35. 35.575 increased by 12% =
36. 36.145 decreased by 20% =
37. 37.800 increased by 15% =
38. 38.110 decreased by 10% =
39. 39.700 decreased by 35% =
40. 40.720 increased by 5% =

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