Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 832 · 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. 1.330 decreased by 10% =
2. 2.800 increased by 8% =
3. 3.550 increased by 8% =
4. 4.520 decreased by 15% =
5. 5.665 increased by 40% =
6. 6.120 increased by 35% =
7. 7.100 decreased by 12% =
8. 8.270 decreased by 30% =
9. 9.700 decreased by 8% =
10. 10.56 decreased by 50% =
11. 11.500 increased by 10% =
12. 12.175 decreased by 12% =
13. 13.788 decreased by 25% =
14. 14.660 decreased by 15% =
15. 15.780 decreased by 20% =
16. 16.644 decreased by 50% =
17. 17.80 decreased by 75% =
18. 18.460 increased by 10% =
19. 19.308 decreased by 75% =
20. 20.745 increased by 20% =
21. 21.240 decreased by 35% =
22. 22.40 decreased by 15% =
23. 23.780 increased by 30% =
24. 24.436 increased by 25% =
25. 25.690 increased by 30% =
26. 26.520 increased by 15% =
27. 27.530 decreased by 30% =
28. 28.50 decreased by 50% =
29. 29.260 increased by 5% =
30. 30.632 increased by 75% =
31. 31.460 decreased by 35% =
32. 32.275 decreased by 12% =
33. 33.400 decreased by 8% =
34. 34.440 decreased by 10% =
35. 35.398 increased by 50% =
36. 36.780 increased by 35% =
37. 37.375 decreased by 12% =
38. 38.700 increased by 8% =
39. 39.536 increased by 50% =
40. 40.550 decreased by 10% =

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