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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 215 · 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. 1.27 × 14 =
  2. 2.15 × 18 =
  3. 3.22 × 14 =
  4. 4.13 × 16 =
  5. 5.46 × 18 =
  6. 6.14 × 16 =
  7. 7.39 × 12 =
  8. 8.24 × 14 =
  9. 9.41 × 14 =
  10. 10.46 × 14 =
  11. 11.44 × 16 =
  12. 12.22 × 24 =
  13. 13.19 × 12 =
  14. 14.32 × 14 =
  15. 15.47 × 16 =
  16. 16.44 × 18 =
  17. 17.39 × 15 =
  18. 18.13 × 18 =
  19. 19.25 × 14 =
  20. 20.44 × 15 =
  21. 21.41 × 16 =
  22. 22.11 × 14 =
  23. 23.34 × 24 =
  24. 24.23 × 14 =
  25. 25.36 × 14 =
  26. 26.25 × 24 =
  27. 27.23 × 16 =
  28. 28.16 × 15 =
  29. 29.40 × 15 =
  30. 30.26 × 12 =
  31. 31.47 × 12 =
  32. 32.36 × 24 =
  33. 33.35 × 12 =
  34. 34.34 × 14 =
  35. 35.48 × 18 =
  36. 36.21 × 12 =
  37. 37.20 × 15 =
  38. 38.12 × 15 =
  39. 39.28 × 12 =
  40. 40.30 × 14 =

Answer key

  1. 378
  2. 270
  3. 308
  4. 208
  5. 828
  6. 224
  7. 468
  8. 336
  9. 574
  10. 644
  11. 704
  12. 528
  13. 228
  14. 448
  15. 752
  16. 792
  17. 585
  18. 234
  19. 350
  20. 660
  21. 656
  22. 154
  23. 816
  24. 322
  25. 504
  26. 600
  27. 368
  28. 240
  29. 600
  30. 312
  31. 564
  32. 864
  33. 420
  34. 476
  35. 864
  36. 252
  37. 300
  38. 180
  39. 336
  40. 420

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