Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 52 · 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. 1.620 decreased by 5% =
2. 2.675 decreased by 12% =
3. 3.332 increased by 25% =
4. 4.700 decreased by 12% =
5. 5.585 increased by 20% =
6. 6.170 decreased by 10% =
7. 7.720 increased by 35% =
8. 8.500 increased by 8% =
9. 9.475 decreased by 8% =
10. 10.690 increased by 20% =
11. 11.190 decreased by 10% =
12. 12.150 decreased by 12% =
13. 13.325 increased by 60% =
14. 14.320 increased by 5% =
15. 15.180 decreased by 20% =
16. 16.220 increased by 10% =
17. 17.160 decreased by 20% =
18. 18.165 increased by 20% =
19. 19.630 decreased by 40% =
20. 20.500 decreased by 15% =
21. 21.100 increased by 50% =
22. 22.250 decreased by 12% =
23. 23.242 decreased by 50% =
24. 24.400 decreased by 35% =
25. 25.80 increased by 5% =
26. 26.100 increased by 10% =
27. 27.604 increased by 75% =
28. 28.420 increased by 35% =
29. 29.564 increased by 25% =
30. 30.330 decreased by 10% =
31. 31.428 increased by 25% =
32. 32.275 decreased by 40% =
33. 33.620 decreased by 35% =
34. 34.285 decreased by 60% =
35. 35.800 decreased by 5% =
36. 36.384 decreased by 75% =
37. 37.400 increased by 15% =
38. 38.280 increased by 15% =
39. 39.360 decreased by 30% =
40. 40.48 increased by 50% =

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