Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 634 · 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. 1.142 increased by 50% =
2. 2.236 increased by 75% =
3. 3.400 increased by 35% =
4. 4.720 increased by 35% =
5. 5.660 increased by 5% =
6. 6.740 increased by 60% =
7. 7.620 decreased by 15% =
8. 8.790 increased by 60% =
9. 9.370 increased by 20% =
10. 10.255 increased by 20% =
11. 11.320 decreased by 30% =
12. 12.40 decreased by 5% =
13. 13.300 increased by 20% =
14. 14.220 increased by 30% =
15. 15.220 increased by 30% =
16. 16.320 increased by 60% =
17. 17.50 increased by 12% =
18. 18.240 increased by 75% =
19. 19.500 decreased by 30% =
20. 20.780 increased by 35% =
21. 21.300 decreased by 5% =
22. 22.572 increased by 75% =
23. 23.570 decreased by 30% =
24. 24.750 increased by 40% =
25. 25.120 decreased by 15% =
26. 26.460 increased by 25% =
27. 27.590 decreased by 60% =
28. 28.60 increased by 35% =
29. 29.490 increased by 40% =
30. 30.375 increased by 12% =
31. 31.362 decreased by 50% =
32. 32.560 decreased by 30% =
33. 33.220 decreased by 20% =
34. 34.580 decreased by 25% =
35. 35.140 increased by 25% =
36. 36.100 increased by 20% =
37. 37.780 increased by 30% =
38. 38.210 increased by 10% =
39. 39.440 decreased by 5% =
40. 40.140 decreased by 50% =

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