Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 260 · 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. 1.720 increased by 15% =
2. 2.692 increased by 25% =
3. 3.90 decreased by 10% =
4. 4.90 increased by 10% =
5. 5.360 decreased by 15% =
6. 6.570 decreased by 20% =
7. 7.780 decreased by 40% =
8. 8.660 increased by 5% =
9. 9.180 decreased by 5% =
10. 10.546 increased by 50% =
11. 11.140 increased by 35% =
12. 12.775 decreased by 8% =
13. 13.660 increased by 40% =
14. 14.344 increased by 25% =
15. 15.620 decreased by 10% =
16. 16.340 increased by 20% =
17. 17.52 decreased by 75% =
18. 18.240 decreased by 10% =
19. 19.340 decreased by 15% =
20. 20.150 increased by 8% =
21. 21.272 decreased by 75% =
22. 22.360 decreased by 5% =
23. 23.790 increased by 30% =
24. 24.112 decreased by 25% =
25. 25.225 decreased by 20% =
26. 26.230 decreased by 50% =
27. 27.292 increased by 50% =
28. 28.148 increased by 75% =
29. 29.265 increased by 60% =
30. 30.220 increased by 15% =
31. 31.80 increased by 10% =
32. 32.80 decreased by 25% =
33. 33.445 decreased by 40% =
34. 34.776 increased by 75% =
35. 35.200 decreased by 15% =
36. 36.60 increased by 5% =
37. 37.640 increased by 35% =
38. 38.720 decreased by 30% =
39. 39.280 decreased by 5% =
40. 40.325 decreased by 8% =

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