Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 943 · 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. 1.455 increased by 20% =
2. 2.400 decreased by 15% =
3. 3.800 decreased by 8% =
4. 4.100 decreased by 60% =
5. 5.320 decreased by 35% =
6. 6.730 decreased by 30% =
7. 7.80 increased by 15% =
8. 8.402 decreased by 50% =
9. 9.540 decreased by 15% =
10. 10.375 increased by 8% =
11. 11.570 increased by 10% =
12. 12.550 increased by 60% =
13. 13.400 increased by 25% =
14. 14.180 decreased by 5% =
15. 15.356 decreased by 25% =
16. 16.456 decreased by 25% =
17. 17.312 increased by 25% =
18. 18.88 decreased by 50% =
19. 19.60 decreased by 30% =
20. 20.535 increased by 60% =
21. 21.700 increased by 10% =
22. 22.360 increased by 35% =
23. 23.440 decreased by 5% =
24. 24.640 increased by 15% =
25. 25.730 decreased by 10% =
26. 26.460 increased by 15% =
27. 27.300 increased by 15% =
28. 28.140 increased by 5% =
29. 29.800 increased by 30% =
30. 30.280 decreased by 15% =
31. 31.745 increased by 60% =
32. 32.648 decreased by 50% =
33. 33.720 increased by 35% =
34. 34.730 increased by 10% =
35. 35.50 decreased by 8% =
36. 36.250 decreased by 12% =
37. 37.75 decreased by 8% =
38. 38.780 increased by 35% =
39. 39.550 decreased by 20% =
40. 40.800 decreased by 35% =

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