Percentage Increase and Decrease Trick Worksheet
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.
NameDateTime takenScore ___ / 40
- 1.220 increased by 75% =
- 2.585 decreased by 20% =
- 3.400 decreased by 12% =
- 4.85 decreased by 60% =
- 5.70 increased by 10% =
- 6.440 increased by 25% =
- 7.226 increased by 50% =
- 8.80 decreased by 30% =
- 9.60 decreased by 5% =
- 10.256 increased by 75% =
- 11.640 increased by 25% =
- 12.600 decreased by 15% =
- 13.360 increased by 35% =
- 14.670 decreased by 30% =
- 15.520 decreased by 30% =
- 16.440 decreased by 35% =
- 17.125 increased by 8% =
- 18.140 increased by 30% =
- 19.95 increased by 20% =
- 20.472 increased by 75% =
- 21.675 increased by 8% =
- 22.125 decreased by 20% =
- 23.150 decreased by 40% =
- 24.100 increased by 8% =
- 25.440 decreased by 15% =
- 26.200 increased by 12% =
- 27.120 increased by 15% =
- 28.240 decreased by 5% =
- 29.692 increased by 75% =
- 30.405 decreased by 40% =
- 31.280 increased by 35% =
- 32.52 decreased by 25% =
- 33.340 decreased by 10% =
- 34.100 decreased by 30% =
- 35.225 decreased by 8% =
- 36.350 decreased by 30% =
- 37.660 decreased by 15% =
- 38.520 decreased by 35% =
- 39.640 increased by 25% =
- 40.348 decreased by 25% =
Answer key
- 385
- 468
- 352
- 34
- 77
- 550
- 339
- 56
- 57
- 448
- 800
- 510
- 486
- 469
- 364
- 286
- 135
- 182
- 114
- 826
- 729
- 100
- 90
- 108
- 374
- 224
- 138
- 228
- 1211
- 243
- 378
- 39
- 306
- 70
- 207
- 245
- 561
- 338
- 800
- 261
Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths