Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 401 · 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. 1.70 increased by 10% =
2. 2.164 decreased by 50% =
3. 3.156 decreased by 75% =
4. 4.775 decreased by 40% =
5. 5.400 increased by 12% =
6. 6.452 decreased by 25% =
7. 7.420 decreased by 30% =
8. 8.768 increased by 25% =
9. 9.300 decreased by 8% =
10. 10.680 increased by 15% =
11. 11.632 decreased by 25% =
12. 12.500 increased by 5% =
13. 13.760 decreased by 15% =
14. 14.370 increased by 40% =
15. 15.142 decreased by 50% =
16. 16.40 decreased by 10% =
17. 17.260 increased by 15% =
18. 18.190 decreased by 50% =
19. 19.700 increased by 60% =
20. 20.140 decreased by 15% =
21. 21.668 decreased by 75% =
22. 22.338 increased by 50% =
23. 23.800 decreased by 15% =
24. 24.160 increased by 10% =
25. 25.220 increased by 35% =
26. 26.140 increased by 5% =
27. 27.230 decreased by 30% =
28. 28.652 increased by 50% =
29. 29.800 increased by 15% =
30. 30.125 increased by 12% =
31. 31.745 increased by 60% =
32. 32.110 decreased by 30% =
33. 33.640 decreased by 10% =
34. 34.632 increased by 50% =
35. 35.456 decreased by 75% =
36. 36.505 decreased by 20% =
37. 37.775 decreased by 8% =
38. 38.350 decreased by 10% =
39. 39.160 increased by 30% =
40. 40.540 increased by 15% =

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