Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 644 · 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. 1.185 decreased by 40% =
2. 2.85 decreased by 20% =
3. 3.774 increased by 50% =
4. 4.312 increased by 75% =
5. 5.148 increased by 50% =
6. 6.50 decreased by 12% =
7. 7.220 increased by 5% =
8. 8.420 increased by 5% =
9. 9.50 increased by 12% =
10. 10.710 decreased by 60% =
11. 11.644 increased by 25% =
12. 12.540 increased by 5% =
13. 13.710 decreased by 30% =
14. 14.600 decreased by 5% =
15. 15.630 decreased by 60% =
16. 16.570 increased by 10% =
17. 17.110 decreased by 10% =
18. 18.250 increased by 60% =
19. 19.740 decreased by 5% =
20. 20.170 decreased by 30% =
21. 21.786 decreased by 50% =
22. 22.190 increased by 60% =
23. 23.482 increased by 50% =
24. 24.350 decreased by 10% =
25. 25.300 increased by 5% =
26. 26.260 increased by 10% =
27. 27.380 increased by 40% =
28. 28.765 increased by 20% =
29. 29.460 decreased by 20% =
30. 30.290 decreased by 40% =
31. 31.780 decreased by 10% =
32. 32.430 increased by 30% =
33. 33.240 decreased by 5% =
34. 34.220 increased by 15% =
35. 35.330 decreased by 40% =
36. 36.360 increased by 35% =
37. 37.560 decreased by 35% =
38. 38.400 decreased by 40% =
39. 39.780 increased by 30% =
40. 40.86 increased by 50% =

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