Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 776 · 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. 1.390 increased by 30% =
2. 2.232 increased by 75% =
3. 3.110 decreased by 10% =
4. 4.360 increased by 15% =
5. 5.200 decreased by 15% =
6. 6.245 decreased by 20% =
7. 7.160 increased by 10% =
8. 8.200 increased by 12% =
9. 9.675 increased by 40% =
10. 10.608 decreased by 75% =
11. 11.160 decreased by 10% =
12. 12.608 increased by 50% =
13. 13.510 decreased by 30% =
14. 14.380 increased by 40% =
15. 15.660 increased by 5% =
16. 16.180 increased by 60% =
17. 17.420 increased by 75% =
18. 18.80 decreased by 40% =
19. 19.780 decreased by 50% =
20. 20.682 increased by 50% =
21. 21.516 decreased by 50% =
22. 22.120 decreased by 35% =
23. 23.390 decreased by 20% =
24. 24.220 increased by 15% =
25. 25.270 increased by 50% =
26. 26.96 decreased by 75% =
27. 27.525 increased by 12% =
28. 28.435 increased by 60% =
29. 29.290 increased by 20% =
30. 30.560 decreased by 5% =
31. 31.664 increased by 25% =
32. 32.500 increased by 20% =
33. 33.680 decreased by 5% =
34. 34.200 decreased by 40% =
35. 35.80 decreased by 25% =
36. 36.300 decreased by 5% =
37. 37.680 decreased by 5% =
38. 38.120 increased by 15% =
39. 39.125 decreased by 8% =
40. 40.104 increased by 50% =

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