Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 889 · 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 increased by 30% =
2. 2.120 decreased by 20% =
3. 3.560 increased by 15% =
4. 4.350 decreased by 8% =
5. 5.644 decreased by 75% =
6. 6.260 increased by 35% =
7. 7.240 increased by 15% =
8. 8.325 increased by 12% =
9. 9.225 increased by 8% =
10. 10.150 decreased by 12% =
11. 11.270 increased by 50% =
12. 12.340 decreased by 40% =
13. 13.220 increased by 5% =
14. 14.88 increased by 75% =
15. 15.248 increased by 50% =
16. 16.250 increased by 8% =
17. 17.488 increased by 75% =
18. 18.228 decreased by 75% =
19. 19.760 increased by 35% =
20. 20.540 decreased by 15% =
21. 21.220 increased by 30% =
22. 22.716 increased by 75% =
23. 23.660 decreased by 15% =
24. 24.295 increased by 40% =
25. 25.728 decreased by 75% =
26. 26.50 increased by 40% =
27. 27.740 decreased by 10% =
28. 28.140 increased by 35% =
29. 29.160 increased by 60% =
30. 30.660 decreased by 15% =
31. 31.370 decreased by 30% =
32. 32.276 increased by 25% =
33. 33.100 increased by 15% =
34. 34.800 increased by 20% =
35. 35.635 decreased by 40% =
36. 36.744 increased by 75% =
37. 37.565 increased by 20% =
38. 38.390 increased by 20% =
39. 39.380 decreased by 25% =
40. 40.180 increased by 35% =

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