Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 534 · 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. 1.330 increased by 10% =
2. 2.720 decreased by 35% =
3. 3.595 increased by 60% =
4. 4.740 decreased by 30% =
5. 5.348 decreased by 25% =
6. 6.110 decreased by 30% =
7. 7.368 decreased by 75% =
8. 8.40 decreased by 35% =
9. 9.750 decreased by 12% =
10. 10.85 increased by 20% =
11. 11.790 decreased by 10% =
12. 12.380 increased by 15% =
13. 13.728 increased by 75% =
14. 14.740 increased by 20% =
15. 15.710 increased by 20% =
16. 16.100 decreased by 8% =
17. 17.170 decreased by 60% =
18. 18.340 decreased by 25% =
19. 19.400 decreased by 5% =
20. 20.800 decreased by 15% =
21. 21.700 increased by 30% =
22. 22.740 decreased by 15% =
23. 23.570 increased by 30% =
24. 24.725 increased by 60% =
25. 25.795 increased by 20% =
26. 26.398 increased by 50% =
27. 27.230 decreased by 10% =
28. 28.425 increased by 12% =
29. 29.376 increased by 25% =
30. 30.625 increased by 12% =
31. 31.575 decreased by 8% =
32. 32.575 decreased by 8% =
33. 33.296 increased by 25% =
34. 34.640 decreased by 15% =
35. 35.740 decreased by 15% =
36. 36.460 decreased by 15% =
37. 37.470 increased by 20% =
38. 38.80 increased by 15% =
39. 39.718 increased by 50% =
40. 40.540 increased by 10% =

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