Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 891 · 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. 1.125 increased by 20% =
2. 2.750 increased by 8% =
3. 3.56 decreased by 25% =
4. 4.552 decreased by 75% =
5. 5.205 decreased by 20% =
6. 6.572 increased by 25% =
7. 7.374 increased by 50% =
8. 8.500 increased by 30% =
9. 9.40 increased by 15% =
10. 10.260 decreased by 5% =
11. 11.270 increased by 30% =
12. 12.185 increased by 60% =
13. 13.510 decreased by 30% =
14. 14.725 decreased by 8% =
15. 15.140 decreased by 40% =
16. 16.236 increased by 25% =
17. 17.340 increased by 15% =
18. 18.700 decreased by 35% =
19. 19.800 decreased by 15% =
20. 20.240 decreased by 15% =
21. 21.572 increased by 75% =
22. 22.380 increased by 20% =
23. 23.290 decreased by 30% =
24. 24.120 decreased by 30% =
25. 25.250 decreased by 12% =
26. 26.740 increased by 15% =
27. 27.380 decreased by 10% =
28. 28.180 decreased by 5% =
29. 29.375 increased by 12% =
30. 30.525 increased by 60% =
31. 31.300 increased by 12% =
32. 32.360 increased by 30% =
33. 33.300 decreased by 10% =
34. 34.620 increased by 60% =
35. 35.265 increased by 60% =
36. 36.100 increased by 25% =
37. 37.100 decreased by 12% =
38. 38.748 increased by 75% =
39. 39.600 increased by 8% =
40. 40.85 increased by 20% =

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