Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 942 · 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. 1.270 decreased by 30% =
2. 2.752 increased by 50% =
3. 3.330 increased by 20% =
4. 4.280 decreased by 35% =
5. 5.500 increased by 15% =
6. 6.630 decreased by 20% =
7. 7.450 increased by 8% =
8. 8.650 decreased by 20% =
9. 9.195 increased by 20% =
10. 10.80 increased by 25% =
11. 11.718 decreased by 50% =
12. 12.225 increased by 12% =
13. 13.720 increased by 5% =
14. 14.748 increased by 75% =
15. 15.720 increased by 20% =
16. 16.250 increased by 8% =
17. 17.590 decreased by 30% =
18. 18.365 decreased by 20% =
19. 19.510 increased by 20% =
20. 20.560 increased by 15% =
21. 21.590 decreased by 10% =
22. 22.325 increased by 8% =
23. 23.460 decreased by 30% =
24. 24.270 increased by 10% =
25. 25.40 increased by 25% =
26. 26.225 decreased by 8% =
27. 27.740 decreased by 10% =
28. 28.215 increased by 20% =
29. 29.580 decreased by 10% =
30. 30.385 decreased by 20% =
31. 31.400 increased by 8% =
32. 32.280 increased by 30% =
33. 33.112 decreased by 75% =
34. 34.500 increased by 30% =
35. 35.350 increased by 20% =
36. 36.98 decreased by 50% =
37. 37.680 increased by 10% =
38. 38.200 increased by 5% =
39. 39.788 increased by 75% =
40. 40.140 increased by 60% =

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