Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 353 · 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 increased by 40% =
2. 2.60 decreased by 35% =
3. 3.340 increased by 60% =
4. 4.140 decreased by 40% =
5. 5.188 decreased by 75% =
6. 6.140 decreased by 5% =
7. 7.210 increased by 30% =
8. 8.360 increased by 15% =
9. 9.255 decreased by 40% =
10. 10.320 decreased by 30% =
11. 11.170 increased by 10% =
12. 12.40 increased by 5% =
13. 13.240 increased by 15% =
14. 14.648 decreased by 50% =
15. 15.620 decreased by 15% =
16. 16.70 decreased by 10% =
17. 17.420 decreased by 10% =
18. 18.262 decreased by 50% =
19. 19.730 increased by 30% =
20. 20.400 increased by 8% =
21. 21.530 increased by 10% =
22. 22.726 increased by 50% =
23. 23.464 decreased by 75% =
24. 24.600 decreased by 35% =
25. 25.480 decreased by 10% =
26. 26.660 increased by 30% =
27. 27.746 decreased by 50% =
28. 28.320 increased by 40% =
29. 29.350 decreased by 12% =
30. 30.676 decreased by 50% =
31. 31.560 decreased by 35% =
32. 32.532 decreased by 25% =
33. 33.220 decreased by 30% =
34. 34.600 increased by 8% =
35. 35.435 increased by 20% =
36. 36.235 increased by 20% =
37. 37.380 decreased by 75% =
38. 38.340 increased by 15% =
39. 39.690 decreased by 30% =
40. 40.772 increased by 75% =

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