Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 544 · 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. 1.100 decreased by 10% =
2. 2.510 increased by 40% =
3. 3.650 decreased by 12% =
4. 4.385 decreased by 60% =
5. 5.420 decreased by 10% =
6. 6.640 decreased by 30% =
7. 7.475 increased by 8% =
8. 8.740 increased by 5% =
9. 9.580 decreased by 40% =
10. 10.65 increased by 60% =
11. 11.495 increased by 20% =
12. 12.470 decreased by 60% =
13. 13.345 decreased by 40% =
14. 14.115 decreased by 60% =
15. 15.154 decreased by 50% =
16. 16.675 increased by 8% =
17. 17.240 decreased by 10% =
18. 18.500 increased by 5% =
19. 19.596 increased by 25% =
20. 20.436 decreased by 75% =
21. 21.600 decreased by 5% =
22. 22.550 decreased by 12% =
23. 23.230 decreased by 30% =
24. 24.278 increased by 50% =
25. 25.550 decreased by 8% =
26. 26.125 decreased by 60% =
27. 27.60 increased by 35% =
28. 28.200 increased by 30% =
29. 29.444 increased by 25% =
30. 30.100 decreased by 5% =
31. 31.405 increased by 20% =
32. 32.50 decreased by 8% =
33. 33.760 increased by 5% =
34. 34.125 decreased by 12% =
35. 35.210 decreased by 10% =
36. 36.594 increased by 50% =
37. 37.130 decreased by 30% =
38. 38.252 increased by 50% =
39. 39.150 decreased by 20% =
40. 40.170 increased by 10% =

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