Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 443 · 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. 1.180 increased by 20% =
2. 2.700 decreased by 30% =
3. 3.390 decreased by 50% =
4. 4.480 increased by 35% =
5. 5.625 decreased by 8% =
6. 6.240 decreased by 5% =
7. 7.160 increased by 5% =
8. 8.134 increased by 50% =
9. 9.675 decreased by 8% =
10. 10.175 increased by 40% =
11. 11.375 increased by 8% =
12. 12.370 increased by 10% =
13. 13.128 decreased by 75% =
14. 14.635 increased by 40% =
15. 15.180 increased by 5% =
16. 16.680 decreased by 40% =
17. 17.120 increased by 5% =
18. 18.292 increased by 25% =
19. 19.740 decreased by 35% =
20. 20.40 decreased by 35% =
21. 21.148 decreased by 25% =
22. 22.150 increased by 10% =
23. 23.336 increased by 50% =
24. 24.720 increased by 15% =
25. 25.50 decreased by 40% =
26. 26.500 increased by 12% =
27. 27.720 increased by 15% =
28. 28.60 increased by 5% =
29. 29.795 increased by 60% =
30. 30.200 increased by 35% =
31. 31.460 increased by 5% =
32. 32.240 increased by 5% =
33. 33.250 decreased by 30% =
34. 34.775 increased by 60% =
35. 35.400 decreased by 15% =
36. 36.500 decreased by 75% =
37. 37.400 increased by 20% =
38. 38.610 decreased by 30% =
39. 39.700 increased by 5% =
40. 40.170 increased by 30% =

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