Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 448 · 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. 1.650 increased by 20% =
2. 2.622 decreased by 50% =
3. 3.695 decreased by 20% =
4. 4.120 decreased by 15% =
5. 5.100 increased by 12% =
6. 6.294 increased by 50% =
7. 7.530 increased by 40% =
8. 8.725 increased by 12% =
9. 9.320 increased by 30% =
10. 10.375 decreased by 8% =
11. 11.190 increased by 10% =
12. 12.205 increased by 60% =
13. 13.340 decreased by 30% =
14. 14.350 increased by 12% =
15. 15.230 increased by 10% =
16. 16.292 increased by 50% =
17. 17.580 increased by 10% =
18. 18.125 decreased by 40% =
19. 19.690 increased by 30% =
20. 20.196 decreased by 25% =
21. 21.700 decreased by 30% =
22. 22.720 decreased by 5% =
23. 23.210 decreased by 40% =
24. 24.400 increased by 12% =
25. 25.148 decreased by 25% =
26. 26.426 decreased by 50% =
27. 27.90 decreased by 30% =
28. 28.436 decreased by 75% =
29. 29.340 decreased by 15% =
30. 30.270 increased by 60% =
31. 31.765 decreased by 40% =
32. 32.380 increased by 35% =
33. 33.310 decreased by 20% =
34. 34.70 decreased by 10% =
35. 35.700 increased by 8% =
36. 36.720 increased by 10% =
37. 37.720 decreased by 5% =
38. 38.736 increased by 25% =
39. 39.564 decreased by 25% =
40. 40.328 increased by 25% =

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