Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 917 · 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. 1.384 increased by 75% =
2. 2.120 increased by 35% =
3. 3.260 increased by 15% =
4. 4.420 increased by 35% =
5. 5.136 decreased by 50% =
6. 6.180 decreased by 15% =
7. 7.580 decreased by 35% =
8. 8.358 increased by 50% =
9. 9.292 increased by 75% =
10. 10.280 increased by 20% =
11. 11.725 decreased by 8% =
12. 12.755 decreased by 60% =
13. 13.340 increased by 15% =
14. 14.360 decreased by 5% =
15. 15.200 decreased by 5% =
16. 16.550 decreased by 8% =
17. 17.100 increased by 10% =
18. 18.155 increased by 60% =
19. 19.740 decreased by 15% =
20. 20.50 increased by 8% =
21. 21.122 increased by 50% =
22. 22.188 increased by 25% =
23. 23.780 decreased by 20% =
24. 24.660 decreased by 20% =
25. 25.60 decreased by 20% =
26. 26.530 decreased by 10% =
27. 27.85 decreased by 40% =
28. 28.320 decreased by 15% =
29. 29.620 decreased by 5% =
30. 30.396 increased by 75% =
31. 31.270 increased by 20% =
32. 32.100 increased by 12% =
33. 33.120 increased by 5% =
34. 34.500 increased by 35% =
35. 35.620 increased by 40% =
36. 36.760 decreased by 5% =
37. 37.510 increased by 10% =
38. 38.480 increased by 35% =
39. 39.390 increased by 10% =
40. 40.700 increased by 10% =

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