Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 901 · 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. 1.200 increased by 35% =
2. 2.568 decreased by 75% =
3. 3.250 decreased by 8% =
4. 4.100 increased by 20% =
5. 5.250 decreased by 12% =
6. 6.490 decreased by 20% =
7. 7.472 increased by 25% =
8. 8.105 increased by 40% =
9. 9.140 increased by 5% =
10. 10.350 increased by 10% =
11. 11.40 increased by 75% =
12. 12.580 increased by 35% =
13. 13.160 increased by 75% =
14. 14.480 increased by 35% =
15. 15.375 increased by 8% =
16. 16.210 increased by 10% =
17. 17.180 increased by 60% =
18. 18.110 increased by 60% =
19. 19.800 decreased by 5% =
20. 20.160 increased by 35% =
21. 21.220 increased by 10% =
22. 22.250 increased by 12% =
23. 23.800 increased by 10% =
24. 24.440 increased by 5% =
25. 25.205 decreased by 60% =
26. 26.106 decreased by 50% =
27. 27.740 decreased by 15% =
28. 28.174 decreased by 50% =
29. 29.740 decreased by 35% =
30. 30.225 decreased by 8% =
31. 31.60 increased by 30% =
32. 32.120 increased by 15% =
33. 33.190 decreased by 10% =
34. 34.150 increased by 8% =
35. 35.570 increased by 30% =
36. 36.316 increased by 75% =
37. 37.240 decreased by 5% =
38. 38.150 increased by 20% =
39. 39.300 increased by 15% =
40. 40.505 increased by 40% =

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