Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 934 · 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. 1.194 increased by 50% =
2. 2.360 decreased by 30% =
3. 3.460 decreased by 35% =
4. 4.375 decreased by 12% =
5. 5.480 decreased by 15% =
6. 6.620 decreased by 15% =
7. 7.420 increased by 35% =
8. 8.722 decreased by 50% =
9. 9.480 decreased by 5% =
10. 10.525 decreased by 20% =
11. 11.380 decreased by 30% =
12. 12.242 decreased by 50% =
13. 13.650 increased by 60% =
14. 14.560 increased by 10% =
15. 15.210 increased by 10% =
16. 16.680 decreased by 5% =
17. 17.258 increased by 50% =
18. 18.240 increased by 10% =
19. 19.420 increased by 40% =
20. 20.160 increased by 20% =
21. 21.425 decreased by 8% =
22. 22.250 increased by 30% =
23. 23.60 increased by 15% =
24. 24.376 increased by 75% =
25. 25.220 decreased by 75% =
26. 26.45 decreased by 20% =
27. 27.200 increased by 8% =
28. 28.120 decreased by 15% =
29. 29.750 decreased by 12% =
30. 30.410 increased by 30% =
31. 31.192 decreased by 75% =
32. 32.620 increased by 5% =
33. 33.758 increased by 50% =
34. 34.115 increased by 40% =
35. 35.350 decreased by 12% =
36. 36.164 increased by 75% =
37. 37.450 increased by 8% =
38. 38.360 increased by 30% =
39. 39.400 increased by 10% =
40. 40.630 increased by 30% =

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