Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 669 · 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. 1.780 decreased by 15% =
2. 2.44 decreased by 25% =
3. 3.75 decreased by 40% =
4. 4.355 increased by 60% =
5. 5.512 increased by 50% =
6. 6.680 decreased by 10% =
7. 7.230 decreased by 20% =
8. 8.210 decreased by 60% =
9. 9.700 increased by 12% =
10. 10.220 decreased by 25% =
11. 11.530 increased by 10% =
12. 12.440 increased by 35% =
13. 13.460 increased by 35% =
14. 14.432 decreased by 25% =
15. 15.520 decreased by 40% =
16. 16.175 increased by 8% =
17. 17.320 increased by 25% =
18. 18.54 decreased by 50% =
19. 19.620 decreased by 15% =
20. 20.125 decreased by 12% =
21. 21.520 increased by 60% =
22. 22.345 increased by 60% =
23. 23.360 increased by 35% =
24. 24.775 increased by 12% =
25. 25.456 decreased by 75% =
26. 26.256 decreased by 50% =
27. 27.460 increased by 15% =
28. 28.40 decreased by 15% =
29. 29.80 increased by 35% =
30. 30.375 decreased by 40% =
31. 31.385 increased by 20% =
32. 32.275 increased by 8% =
33. 33.335 decreased by 20% =
34. 34.400 decreased by 15% =
35. 35.75 increased by 12% =
36. 36.48 decreased by 75% =
37. 37.45 increased by 40% =
38. 38.220 increased by 5% =
39. 39.600 increased by 8% =
40. 40.784 increased by 75% =

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