Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 954 · 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. 1.616 decreased by 50% =
2. 2.510 decreased by 20% =
3. 3.320 increased by 15% =
4. 4.275 decreased by 8% =
5. 5.370 increased by 20% =
6. 6.500 decreased by 8% =
7. 7.184 increased by 25% =
8. 8.674 increased by 50% =
9. 9.372 increased by 75% =
10. 10.514 increased by 50% =
11. 11.55 increased by 40% =
12. 12.610 decreased by 20% =
13. 13.665 decreased by 60% =
14. 14.180 decreased by 25% =
15. 15.280 increased by 40% =
16. 16.175 decreased by 20% =
17. 17.700 increased by 5% =
18. 18.150 decreased by 12% =
19. 19.780 increased by 10% =
20. 20.168 decreased by 25% =
21. 21.225 increased by 8% =
22. 22.50 decreased by 8% =
23. 23.180 decreased by 35% =
24. 24.350 decreased by 40% =
25. 25.120 increased by 5% =
26. 26.320 increased by 15% =
27. 27.520 increased by 5% =
28. 28.220 decreased by 15% =
29. 29.160 decreased by 15% =
30. 30.440 increased by 60% =
31. 31.420 decreased by 25% =
32. 32.240 increased by 15% =
33. 33.310 decreased by 50% =
34. 34.100 decreased by 5% =
35. 35.75 increased by 8% =
36. 36.460 decreased by 30% =
37. 37.300 decreased by 5% =
38. 38.660 increased by 15% =
39. 39.150 increased by 12% =
40. 40.435 decreased by 40% =

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