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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 786 · 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. 1.48 × 16 =
  2. 2.39 × 14 =
  3. 3.45 × 18 =
  4. 4.25 × 16 =
  5. 5.21 × 14 =
  6. 6.41 × 24 =
  7. 7.40 × 24 =
  8. 8.34 × 14 =
  9. 9.40 × 18 =
  10. 10.38 × 24 =
  11. 11.34 × 12 =
  12. 12.46 × 14 =
  13. 13.42 × 12 =
  14. 14.17 × 15 =
  15. 15.36 × 18 =
  16. 16.33 × 14 =
  17. 17.44 × 15 =
  18. 18.18 × 16 =
  19. 19.16 × 15 =
  20. 20.40 × 12 =
  21. 21.38 × 18 =
  22. 22.35 × 24 =
  23. 23.13 × 12 =
  24. 24.11 × 14 =
  25. 25.49 × 12 =
  26. 26.47 × 12 =
  27. 27.28 × 14 =
  28. 28.46 × 15 =
  29. 29.21 × 12 =
  30. 30.41 × 12 =
  31. 31.16 × 14 =
  32. 32.44 × 12 =
  33. 33.11 × 18 =
  34. 34.30 × 14 =
  35. 35.32 × 16 =
  36. 36.20 × 18 =
  37. 37.20 × 15 =
  38. 38.31 × 14 =
  39. 39.36 × 12 =
  40. 40.33 × 12 =

Answer key

  1. 768
  2. 546
  3. 810
  4. 400
  5. 294
  6. 984
  7. 960
  8. 476
  9. 720
  10. 912
  11. 408
  12. 644
  13. 504
  14. 255
  15. 648
  16. 462
  17. 660
  18. 288
  19. 240
  20. 480
  21. 684
  22. 840
  23. 156
  24. 154
  25. 588
  26. 564
  27. 392
  28. 690
  29. 252
  30. 492
  31. 224
  32. 528
  33. 198
  34. 420
  35. 512
  36. 360
  37. 300
  38. 434
  39. 432
  40. 396

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