Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 941 · 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. 1.220 decreased by 20% =
2. 2.800 decreased by 8% =
3. 3.760 increased by 10% =
4. 4.488 decreased by 25% =
5. 5.60 decreased by 25% =
6. 6.168 increased by 25% =
7. 7.580 decreased by 60% =
8. 8.340 increased by 35% =
9. 9.580 decreased by 15% =
10. 10.268 increased by 25% =
11. 11.452 increased by 25% =
12. 12.590 increased by 60% =
13. 13.690 decreased by 50% =
14. 14.760 decreased by 5% =
15. 15.250 decreased by 12% =
16. 16.100 increased by 30% =
17. 17.568 decreased by 25% =
18. 18.40 decreased by 10% =
19. 19.640 decreased by 10% =
20. 20.470 decreased by 40% =
21. 21.320 increased by 15% =
22. 22.716 increased by 75% =
23. 23.455 increased by 20% =
24. 24.660 increased by 10% =
25. 25.700 increased by 5% =
26. 26.175 increased by 60% =
27. 27.80 increased by 40% =
28. 28.660 decreased by 5% =
29. 29.800 increased by 10% =
30. 30.120 decreased by 30% =
31. 31.375 decreased by 12% =
32. 32.620 increased by 75% =
33. 33.440 decreased by 5% =
34. 34.430 decreased by 30% =
35. 35.400 increased by 12% =
36. 36.250 decreased by 30% =
37. 37.520 increased by 5% =
38. 38.130 decreased by 10% =
39. 39.400 decreased by 35% =
40. 40.100 decreased by 5% =

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