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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 273 · 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. 1.38 × 18 =
  2. 2.22 × 12 =
  3. 3.26 × 12 =
  4. 4.47 × 12 =
  5. 5.20 × 24 =
  6. 6.37 × 18 =
  7. 7.11 × 16 =
  8. 8.22 × 15 =
  9. 9.34 × 15 =
  10. 10.13 × 12 =
  11. 11.46 × 14 =
  12. 12.11 × 14 =
  13. 13.29 × 15 =
  14. 14.35 × 18 =
  15. 15.20 × 18 =
  16. 16.41 × 14 =
  17. 17.30 × 24 =
  18. 18.42 × 12 =
  19. 19.39 × 18 =
  20. 20.17 × 16 =
  21. 21.25 × 18 =
  22. 22.46 × 16 =
  23. 23.26 × 14 =
  24. 24.21 × 24 =
  25. 25.37 × 14 =
  26. 26.38 × 24 =
  27. 27.21 × 16 =
  28. 28.13 × 18 =
  29. 29.20 × 12 =
  30. 30.31 × 15 =
  31. 31.30 × 12 =
  32. 32.22 × 24 =
  33. 33.43 × 14 =
  34. 34.27 × 24 =
  35. 35.16 × 15 =
  36. 36.22 × 14 =
  37. 37.33 × 24 =
  38. 38.20 × 14 =
  39. 39.27 × 16 =
  40. 40.13 × 24 =

Answer key

  1. 684
  2. 264
  3. 312
  4. 564
  5. 480
  6. 666
  7. 176
  8. 330
  9. 510
  10. 156
  11. 644
  12. 154
  13. 435
  14. 630
  15. 360
  16. 574
  17. 720
  18. 504
  19. 702
  20. 272
  21. 450
  22. 736
  23. 364
  24. 504
  25. 518
  26. 912
  27. 336
  28. 234
  29. 240
  30. 465
  31. 360
  32. 528
  33. 602
  34. 648
  35. 240
  36. 308
  37. 792
  38. 280
  39. 432
  40. 312

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