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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 505 · 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. 1.14 × 12 =
  2. 2.15 × 14 =
  3. 3.24 × 14 =
  4. 4.48 × 16 =
  5. 5.11 × 16 =
  6. 6.32 × 12 =
  7. 7.39 × 16 =
  8. 8.13 × 12 =
  9. 9.49 × 12 =
  10. 10.36 × 24 =
  11. 11.28 × 14 =
  12. 12.20 × 14 =
  13. 13.33 × 12 =
  14. 14.44 × 16 =
  15. 15.26 × 15 =
  16. 16.26 × 18 =
  17. 17.19 × 15 =
  18. 18.30 × 24 =
  19. 19.38 × 14 =
  20. 20.33 × 15 =
  21. 21.18 × 16 =
  22. 22.35 × 24 =
  23. 23.46 × 18 =
  24. 24.43 × 15 =
  25. 25.14 × 18 =
  26. 26.15 × 16 =
  27. 27.14 × 15 =
  28. 28.18 × 12 =
  29. 29.23 × 18 =
  30. 30.20 × 15 =
  31. 31.13 × 18 =
  32. 32.40 × 14 =
  33. 33.28 × 18 =
  34. 34.16 × 16 =
  35. 35.36 × 14 =
  36. 36.45 × 18 =
  37. 37.38 × 18 =
  38. 38.33 × 24 =
  39. 39.24 × 18 =
  40. 40.22 × 16 =

Answer key

  1. 168
  2. 210
  3. 336
  4. 768
  5. 176
  6. 384
  7. 624
  8. 156
  9. 588
  10. 864
  11. 392
  12. 280
  13. 396
  14. 704
  15. 390
  16. 468
  17. 285
  18. 720
  19. 532
  20. 495
  21. 288
  22. 840
  23. 828
  24. 645
  25. 252
  26. 240
  27. 210
  28. 216
  29. 414
  30. 300
  31. 234
  32. 560
  33. 504
  34. 256
  35. 504
  36. 810
  37. 684
  38. 792
  39. 432
  40. 352

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