Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 195 · 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. 1.350 decreased by 10% =
2. 2.388 decreased by 75% =
3. 3.530 decreased by 10% =
4. 4.500 decreased by 15% =
5. 5.400 increased by 35% =
6. 6.230 increased by 30% =
7. 7.480 decreased by 15% =
8. 8.350 decreased by 40% =
9. 9.332 decreased by 25% =
10. 10.60 increased by 30% =
11. 11.125 increased by 12% =
12. 12.535 decreased by 40% =
13. 13.100 increased by 30% =
14. 14.450 decreased by 40% =
15. 15.690 decreased by 30% =
16. 16.550 decreased by 60% =
17. 17.505 decreased by 60% =
18. 18.65 increased by 20% =
19. 19.148 decreased by 25% =
20. 20.790 increased by 10% =
21. 21.650 decreased by 8% =
22. 22.80 increased by 5% =
23. 23.570 increased by 60% =
24. 24.690 decreased by 30% =
25. 25.630 increased by 10% =
26. 26.240 increased by 10% =
27. 27.525 decreased by 20% =
28. 28.160 decreased by 15% =
29. 29.686 decreased by 50% =
30. 30.565 decreased by 60% =
31. 31.475 increased by 8% =
32. 32.300 decreased by 8% =
33. 33.356 decreased by 25% =
34. 34.280 decreased by 5% =
35. 35.400 decreased by 5% =
36. 36.735 increased by 20% =
37. 37.425 increased by 12% =
38. 38.420 increased by 35% =
39. 39.800 decreased by 15% =
40. 40.690 decreased by 60% =

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