Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 665 · 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. 1.570 decreased by 50% =
2. 2.500 decreased by 5% =
3. 3.168 increased by 25% =
4. 4.228 increased by 25% =
5. 5.600 decreased by 60% =
6. 6.425 increased by 20% =
7. 7.512 increased by 75% =
8. 8.420 decreased by 5% =
9. 9.495 increased by 60% =
10. 10.225 increased by 12% =
11. 11.516 increased by 75% =
12. 12.750 increased by 8% =
13. 13.796 decreased by 25% =
14. 14.112 increased by 25% =
15. 15.480 decreased by 75% =
16. 16.125 decreased by 8% =
17. 17.265 increased by 60% =
18. 18.210 decreased by 10% =
19. 19.276 decreased by 50% =
20. 20.620 increased by 15% =
21. 21.620 increased by 5% =
22. 22.315 increased by 60% =
23. 23.184 increased by 75% =
24. 24.520 decreased by 15% =
25. 25.590 decreased by 60% =
26. 26.780 increased by 25% =
27. 27.795 decreased by 40% =
28. 28.800 decreased by 35% =
29. 29.115 increased by 20% =
30. 30.180 increased by 15% =
31. 31.542 decreased by 50% =
32. 32.700 decreased by 5% =
33. 33.195 increased by 20% =
34. 34.610 decreased by 20% =
35. 35.485 decreased by 60% =
36. 36.450 increased by 30% =
37. 37.155 decreased by 60% =
38. 38.500 increased by 35% =
39. 39.454 decreased by 50% =
40. 40.425 increased by 40% =

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