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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 653 · 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. 1.47 × 12 =
  2. 2.25 × 14 =
  3. 3.39 × 12 =
  4. 4.16 × 12 =
  5. 5.12 × 16 =
  6. 6.40 × 24 =
  7. 7.28 × 16 =
  8. 8.36 × 16 =
  9. 9.34 × 15 =
  10. 10.36 × 12 =
  11. 11.11 × 14 =
  12. 12.20 × 16 =
  13. 13.44 × 16 =
  14. 14.12 × 14 =
  15. 15.12 × 24 =
  16. 16.48 × 18 =
  17. 17.23 × 16 =
  18. 18.13 × 24 =
  19. 19.24 × 12 =
  20. 20.15 × 16 =
  21. 21.46 × 16 =
  22. 22.21 × 24 =
  23. 23.37 × 24 =
  24. 24.39 × 18 =
  25. 25.35 × 14 =
  26. 26.27 × 15 =
  27. 27.23 × 12 =
  28. 28.34 × 12 =
  29. 29.34 × 14 =
  30. 30.39 × 14 =
  31. 31.44 × 18 =
  32. 32.47 × 16 =
  33. 33.19 × 14 =
  34. 34.26 × 18 =
  35. 35.18 × 18 =
  36. 36.46 × 15 =
  37. 37.48 × 16 =
  38. 38.26 × 14 =
  39. 39.27 × 24 =
  40. 40.32 × 15 =

Answer key

  1. 564
  2. 350
  3. 468
  4. 192
  5. 192
  6. 960
  7. 448
  8. 576
  9. 510
  10. 432
  11. 154
  12. 320
  13. 704
  14. 168
  15. 288
  16. 864
  17. 368
  18. 312
  19. 288
  20. 240
  21. 736
  22. 504
  23. 888
  24. 702
  25. 490
  26. 405
  27. 276
  28. 408
  29. 476
  30. 546
  31. 792
  32. 752
  33. 266
  34. 468
  35. 324
  36. 690
  37. 768
  38. 364
  39. 648
  40. 480

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