Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 516 · 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. 1.428 increased by 75% =
2. 2.140 decreased by 10% =
3. 3.600 increased by 30% =
4. 4.500 increased by 12% =
5. 5.240 decreased by 20% =
6. 6.380 decreased by 35% =
7. 7.600 decreased by 8% =
8. 8.220 increased by 5% =
9. 9.200 increased by 5% =
10. 10.480 increased by 40% =
11. 11.775 increased by 20% =
12. 12.390 decreased by 40% =
13. 13.340 decreased by 15% =
14. 14.436 increased by 25% =
15. 15.210 decreased by 20% =
16. 16.284 increased by 25% =
17. 17.480 decreased by 15% =
18. 18.280 increased by 5% =
19. 19.640 increased by 35% =
20. 20.612 increased by 50% =
21. 21.500 increased by 35% =
22. 22.140 increased by 25% =
23. 23.180 increased by 5% =
24. 24.240 increased by 40% =
25. 25.480 increased by 15% =
26. 26.40 decreased by 40% =
27. 27.100 increased by 8% =
28. 28.280 increased by 15% =
29. 29.720 decreased by 35% =
30. 30.40 decreased by 75% =
31. 31.512 increased by 50% =
32. 32.780 decreased by 35% =
33. 33.744 decreased by 25% =
34. 34.572 increased by 50% =
35. 35.320 increased by 15% =
36. 36.655 decreased by 40% =
37. 37.400 increased by 15% =
38. 38.60 increased by 35% =
39. 39.720 decreased by 5% =
40. 40.300 increased by 30% =

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