Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 993 · 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 15% =
2. 2.800 decreased by 15% =
3. 3.310 increased by 30% =
4. 4.620 decreased by 15% =
5. 5.500 increased by 10% =
6. 6.100 decreased by 35% =
7. 7.600 decreased by 10% =
8. 8.455 increased by 60% =
9. 9.220 increased by 20% =
10. 10.685 decreased by 60% =
11. 11.784 decreased by 75% =
12. 12.160 increased by 5% =
13. 13.85 increased by 20% =
14. 14.225 increased by 20% =
15. 15.560 increased by 10% =
16. 16.95 increased by 20% =
17. 17.520 decreased by 30% =
18. 18.115 decreased by 20% =
19. 19.340 increased by 15% =
20. 20.240 increased by 50% =
21. 21.800 increased by 30% =
22. 22.580 decreased by 40% =
23. 23.606 increased by 50% =
24. 24.180 decreased by 35% =
25. 25.320 decreased by 5% =
26. 26.320 decreased by 60% =
27. 27.800 decreased by 20% =
28. 28.770 increased by 40% =
29. 29.800 decreased by 12% =
30. 30.60 increased by 15% =
31. 31.384 decreased by 75% =
32. 32.100 increased by 5% =
33. 33.460 increased by 35% =
34. 34.700 increased by 25% =
35. 35.265 increased by 40% =
36. 36.200 decreased by 5% =
37. 37.720 decreased by 35% =
38. 38.110 increased by 30% =
39. 39.100 increased by 35% =
40. 40.55 decreased by 40% =

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