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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 478 · 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. 1.37 × 24 =
  2. 2.16 × 12 =
  3. 3.32 × 14 =
  4. 4.39 × 15 =
  5. 5.44 × 18 =
  6. 6.40 × 18 =
  7. 7.36 × 16 =
  8. 8.14 × 18 =
  9. 9.24 × 18 =
  10. 10.38 × 24 =
  11. 11.28 × 16 =
  12. 12.42 × 14 =
  13. 13.20 × 14 =
  14. 14.16 × 24 =
  15. 15.25 × 18 =
  16. 16.15 × 16 =
  17. 17.41 × 14 =
  18. 18.24 × 12 =
  19. 19.12 × 14 =
  20. 20.13 × 12 =
  21. 21.13 × 15 =
  22. 22.32 × 12 =
  23. 23.23 × 16 =
  24. 24.21 × 24 =
  25. 25.37 × 15 =
  26. 26.40 × 14 =
  27. 27.20 × 16 =
  28. 28.11 × 14 =
  29. 29.37 × 14 =
  30. 30.45 × 14 =
  31. 31.29 × 15 =
  32. 32.26 × 14 =
  33. 33.27 × 18 =
  34. 34.46 × 15 =
  35. 35.36 × 12 =
  36. 36.35 × 14 =
  37. 37.20 × 24 =
  38. 38.45 × 12 =
  39. 39.47 × 15 =
  40. 40.17 × 15 =

Answer key

  1. 888
  2. 192
  3. 448
  4. 585
  5. 792
  6. 720
  7. 576
  8. 252
  9. 432
  10. 912
  11. 448
  12. 588
  13. 280
  14. 384
  15. 450
  16. 240
  17. 574
  18. 288
  19. 168
  20. 156
  21. 195
  22. 384
  23. 368
  24. 504
  25. 555
  26. 560
  27. 320
  28. 154
  29. 518
  30. 630
  31. 435
  32. 364
  33. 486
  34. 690
  35. 432
  36. 490
  37. 480
  38. 540
  39. 705
  40. 255

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