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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 595 · 40 questions
TalentJR

The trick (Chain the factors): Split the multiplier into two small factors: 12 = 3 × 4, 14 = 2 × 7, 15 = 3 × 5, 16 = 4 × 4, 18 = 2 × 9, 24 = 4 × 6. Multiply by the first factor. Multiply that answer by the second factor (× 4 is double, double).

NameDateTime takenScore ___ / 40
  1. 1.44 × 18 =
  2. 2.24 × 14 =
  3. 3.41 × 12 =
  4. 4.46 × 15 =
  5. 5.26 × 12 =
  6. 6.41 × 16 =
  7. 7.23 × 24 =
  8. 8.13 × 12 =
  9. 9.18 × 24 =
  10. 10.43 × 15 =
  11. 11.37 × 15 =
  12. 12.37 × 24 =
  13. 13.27 × 18 =
  14. 14.21 × 15 =
  15. 15.22 × 18 =
  16. 16.28 × 12 =
  17. 17.11 × 12 =
  18. 18.29 × 14 =
  19. 19.19 × 24 =
  20. 20.24 × 18 =
  21. 21.29 × 15 =
  22. 22.43 × 12 =
  23. 23.11 × 18 =
  24. 24.42 × 14 =
  25. 25.35 × 15 =
  26. 26.28 × 14 =
  27. 27.17 × 16 =
  28. 28.15 × 15 =
  29. 29.35 × 24 =
  30. 30.13 × 14 =
  31. 31.36 × 12 =
  32. 32.20 × 12 =
  33. 33.14 × 14 =
  34. 34.27 × 12 =
  35. 35.15 × 12 =
  36. 36.26 × 16 =
  37. 37.30 × 18 =
  38. 38.40 × 14 =
  39. 39.30 × 16 =
  40. 40.24 × 15 =

Answer key

  1. 792
  2. 336
  3. 492
  4. 690
  5. 312
  6. 656
  7. 552
  8. 156
  9. 432
  10. 645
  11. 555
  12. 888
  13. 486
  14. 315
  15. 396
  16. 336
  17. 132
  18. 406
  19. 456
  20. 432
  21. 435
  22. 516
  23. 198
  24. 588
  25. 525
  26. 392
  27. 272
  28. 225
  29. 840
  30. 182
  31. 432
  32. 240
  33. 196
  34. 324
  35. 180
  36. 416
  37. 540
  38. 560
  39. 480
  40. 360

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