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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 732 · 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 × 12 =
  2. 2.44 × 16 =
  3. 3.21 × 14 =
  4. 4.42 × 14 =
  5. 5.13 × 16 =
  6. 6.41 × 24 =
  7. 7.41 × 12 =
  8. 8.26 × 14 =
  9. 9.47 × 18 =
  10. 10.21 × 16 =
  11. 11.23 × 24 =
  12. 12.33 × 16 =
  13. 13.34 × 16 =
  14. 14.47 × 12 =
  15. 15.21 × 24 =
  16. 16.19 × 12 =
  17. 17.19 × 16 =
  18. 18.37 × 12 =
  19. 19.13 × 15 =
  20. 20.42 × 18 =
  21. 21.45 × 16 =
  22. 22.48 × 18 =
  23. 23.41 × 16 =
  24. 24.36 × 12 =
  25. 25.45 × 18 =
  26. 26.36 × 14 =
  27. 27.23 × 12 =
  28. 28.39 × 15 =
  29. 29.35 × 15 =
  30. 30.11 × 15 =
  31. 31.18 × 16 =
  32. 32.14 × 15 =
  33. 33.36 × 24 =
  34. 34.21 × 15 =
  35. 35.14 × 18 =
  36. 36.36 × 15 =
  37. 37.46 × 16 =
  38. 38.29 × 18 =
  39. 39.38 × 14 =
  40. 40.38 × 18 =

Answer key

  1. 528
  2. 704
  3. 294
  4. 588
  5. 208
  6. 984
  7. 492
  8. 364
  9. 846
  10. 336
  11. 552
  12. 528
  13. 544
  14. 564
  15. 504
  16. 228
  17. 304
  18. 444
  19. 195
  20. 756
  21. 720
  22. 864
  23. 656
  24. 432
  25. 810
  26. 504
  27. 276
  28. 585
  29. 525
  30. 165
  31. 288
  32. 210
  33. 864
  34. 315
  35. 252
  36. 540
  37. 736
  38. 522
  39. 532
  40. 684

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