Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 21 · 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. 1.144 increased by 75% =
2. 2.300 decreased by 60% =
3. 3.405 decreased by 20% =
4. 4.396 decreased by 25% =
5. 5.330 decreased by 20% =
6. 6.596 decreased by 75% =
7. 7.760 increased by 75% =
8. 8.108 decreased by 75% =
9. 9.236 decreased by 75% =
10. 10.176 decreased by 75% =
11. 11.800 increased by 8% =
12. 12.785 decreased by 40% =
13. 13.300 increased by 8% =
14. 14.500 increased by 5% =
15. 15.720 increased by 5% =
16. 16.500 decreased by 30% =
17. 17.546 increased by 50% =
18. 18.100 increased by 12% =
19. 19.120 increased by 5% =
20. 20.570 increased by 10% =
21. 21.100 decreased by 8% =
22. 22.140 increased by 15% =
23. 23.50 decreased by 12% =
24. 24.775 increased by 60% =
25. 25.580 increased by 10% =
26. 26.560 decreased by 5% =
27. 27.340 decreased by 15% =
28. 28.260 decreased by 35% =
29. 29.445 increased by 20% =
30. 30.200 increased by 15% =
31. 31.776 increased by 25% =
32. 32.370 increased by 10% =
33. 33.245 increased by 60% =
34. 34.775 decreased by 8% =
35. 35.372 decreased by 25% =
36. 36.164 decreased by 25% =
37. 37.760 decreased by 10% =
38. 38.144 increased by 25% =
39. 39.80 increased by 30% =
40. 40.800 decreased by 35% =

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