Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 840 · 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. 1.90 increased by 10% =
2. 2.316 decreased by 25% =
3. 3.400 decreased by 5% =
4. 4.312 decreased by 75% =
5. 5.280 decreased by 30% =
6. 6.370 increased by 10% =
7. 7.800 decreased by 8% =
8. 8.600 increased by 15% =
9. 9.52 increased by 75% =
10. 10.620 increased by 5% =
11. 11.650 decreased by 12% =
12. 12.620 increased by 60% =
13. 13.455 decreased by 20% =
14. 14.160 increased by 10% =
15. 15.320 increased by 10% =
16. 16.710 decreased by 20% =
17. 17.175 increased by 8% =
18. 18.260 decreased by 10% =
19. 19.595 increased by 40% =
20. 20.740 decreased by 15% =
21. 21.180 increased by 40% =
22. 22.50 decreased by 8% =
23. 23.125 decreased by 8% =
24. 24.560 decreased by 60% =
25. 25.635 decreased by 20% =
26. 26.280 increased by 5% =
27. 27.100 increased by 30% =
28. 28.380 decreased by 5% =
29. 29.310 increased by 10% =
30. 30.595 decreased by 20% =
31. 31.395 decreased by 20% =
32. 32.248 increased by 25% =
33. 33.640 decreased by 30% =
34. 34.108 decreased by 50% =
35. 35.250 increased by 12% =
36. 36.176 decreased by 25% =
37. 37.310 decreased by 60% =
38. 38.388 increased by 75% =
39. 39.800 increased by 12% =
40. 40.570 increased by 30% =

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