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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 647 · 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. 1.39 × 14 =
  2. 2.48 × 16 =
  3. 3.31 × 18 =
  4. 4.33 × 14 =
  5. 5.28 × 24 =
  6. 6.24 × 24 =
  7. 7.35 × 18 =
  8. 8.44 × 12 =
  9. 9.26 × 16 =
  10. 10.13 × 14 =
  11. 11.33 × 24 =
  12. 12.45 × 14 =
  13. 13.12 × 12 =
  14. 14.25 × 12 =
  15. 15.49 × 18 =
  16. 16.41 × 14 =
  17. 17.44 × 15 =
  18. 18.43 × 14 =
  19. 19.40 × 12 =
  20. 20.13 × 24 =
  21. 21.29 × 18 =
  22. 22.40 × 24 =
  23. 23.22 × 15 =
  24. 24.40 × 14 =
  25. 25.43 × 18 =
  26. 26.20 × 15 =
  27. 27.39 × 18 =
  28. 28.14 × 18 =
  29. 29.36 × 18 =
  30. 30.22 × 12 =
  31. 31.49 × 14 =
  32. 32.24 × 14 =
  33. 33.39 × 24 =
  34. 34.37 × 24 =
  35. 35.14 × 16 =
  36. 36.28 × 14 =
  37. 37.41 × 16 =
  38. 38.20 × 16 =
  39. 39.11 × 24 =
  40. 40.31 × 16 =

Answer key

  1. 546
  2. 768
  3. 558
  4. 462
  5. 672
  6. 576
  7. 630
  8. 528
  9. 416
  10. 182
  11. 792
  12. 630
  13. 144
  14. 300
  15. 882
  16. 574
  17. 660
  18. 602
  19. 480
  20. 312
  21. 522
  22. 960
  23. 330
  24. 560
  25. 774
  26. 300
  27. 702
  28. 252
  29. 648
  30. 264
  31. 686
  32. 336
  33. 936
  34. 888
  35. 224
  36. 392
  37. 656
  38. 320
  39. 264
  40. 496

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