Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 378 · 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. 1.560 decreased by 10% =
2. 2.480 decreased by 35% =
3. 3.160 decreased by 5% =
4. 4.366 decreased by 50% =
5. 5.320 increased by 5% =
6. 6.300 increased by 5% =
7. 7.560 increased by 60% =
8. 8.390 decreased by 20% =
9. 9.420 increased by 40% =
10. 10.800 decreased by 15% =
11. 11.160 increased by 5% =
12. 12.430 decreased by 40% =
13. 13.740 increased by 35% =
14. 14.240 increased by 30% =
15. 15.690 decreased by 40% =
16. 16.575 increased by 8% =
17. 17.400 increased by 10% =
18. 18.480 increased by 15% =
19. 19.250 decreased by 10% =
20. 20.125 decreased by 8% =
21. 21.485 decreased by 20% =
22. 22.640 decreased by 15% =
23. 23.165 increased by 40% =
24. 24.420 increased by 5% =
25. 25.330 increased by 10% =
26. 26.375 decreased by 60% =
27. 27.150 increased by 20% =
28. 28.800 increased by 15% =
29. 29.740 decreased by 40% =
30. 30.220 increased by 10% =
31. 31.210 increased by 30% =
32. 32.110 decreased by 60% =
33. 33.316 decreased by 75% =
34. 34.315 increased by 60% =
35. 35.505 increased by 60% =
36. 36.160 decreased by 30% =
37. 37.578 decreased by 50% =
38. 38.116 increased by 75% =
39. 39.320 increased by 15% =
40. 40.800 increased by 12% =

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