Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 7 · 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. 1.700 increased by 15% =
2. 2.260 increased by 5% =
3. 3.360 increased by 15% =
4. 4.425 increased by 20% =
5. 5.310 increased by 30% =
6. 6.700 decreased by 40% =
7. 7.220 decreased by 35% =
8. 8.176 increased by 50% =
9. 9.320 decreased by 25% =
10. 10.320 decreased by 15% =
11. 11.720 decreased by 35% =
12. 12.520 increased by 35% =
13. 13.760 decreased by 15% =
14. 14.712 increased by 75% =
15. 15.180 increased by 10% =
16. 16.800 increased by 30% =
17. 17.800 increased by 35% =
18. 18.50 decreased by 10% =
19. 19.520 increased by 10% =
20. 20.570 increased by 60% =
21. 21.300 increased by 5% =
22. 22.370 decreased by 50% =
23. 23.88 decreased by 50% =
24. 24.320 decreased by 35% =
25. 25.684 decreased by 75% =
26. 26.420 decreased by 30% =
27. 27.275 decreased by 12% =
28. 28.580 increased by 75% =
29. 29.560 decreased by 15% =
30. 30.260 decreased by 35% =
31. 31.444 decreased by 25% =
32. 32.540 increased by 75% =
33. 33.170 decreased by 30% =
34. 34.150 decreased by 8% =
35. 35.50 increased by 20% =
36. 36.664 decreased by 25% =
37. 37.400 increased by 5% =
38. 38.90 decreased by 10% =
39. 39.100 decreased by 15% =
40. 40.168 decreased by 75% =

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