Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 974 · 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. 1.500 decreased by 12% =
2. 2.745 increased by 20% =
3. 3.800 increased by 8% =
4. 4.412 increased by 25% =
5. 5.760 increased by 10% =
6. 6.80 increased by 5% =
7. 7.630 increased by 30% =
8. 8.625 increased by 12% =
9. 9.708 increased by 75% =
10. 10.172 increased by 75% =
11. 11.560 increased by 35% =
12. 12.644 increased by 25% =
13. 13.750 decreased by 10% =
14. 14.100 increased by 5% =
15. 15.144 increased by 25% =
16. 16.350 decreased by 8% =
17. 17.490 decreased by 20% =
18. 18.100 increased by 30% =
19. 19.415 decreased by 60% =
20. 20.216 increased by 50% =
21. 21.420 decreased by 20% =
22. 22.530 increased by 30% =
23. 23.740 increased by 15% =
24. 24.456 increased by 25% =
25. 25.170 increased by 60% =
26. 26.240 increased by 35% =
27. 27.100 decreased by 35% =
28. 28.620 increased by 40% =
29. 29.280 increased by 15% =
30. 30.120 increased by 10% =
31. 31.750 decreased by 12% =
32. 32.600 increased by 8% =
33. 33.440 increased by 5% =
34. 34.220 increased by 15% =
35. 35.225 decreased by 12% =
36. 36.390 decreased by 10% =
37. 37.330 decreased by 20% =
38. 38.672 decreased by 75% =
39. 39.390 increased by 30% =
40. 40.160 decreased by 35% =

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