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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 331 · 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. 1.23 × 14 =
  2. 2.30 × 12 =
  3. 3.46 × 16 =
  4. 4.35 × 15 =
  5. 5.45 × 12 =
  6. 6.41 × 18 =
  7. 7.31 × 16 =
  8. 8.44 × 15 =
  9. 9.37 × 14 =
  10. 10.21 × 15 =
  11. 11.36 × 12 =
  12. 12.39 × 12 =
  13. 13.45 × 14 =
  14. 14.14 × 24 =
  15. 15.48 × 12 =
  16. 16.18 × 18 =
  17. 17.46 × 14 =
  18. 18.37 × 15 =
  19. 19.47 × 18 =
  20. 20.27 × 15 =
  21. 21.44 × 12 =
  22. 22.14 × 14 =
  23. 23.26 × 24 =
  24. 24.25 × 14 =
  25. 25.23 × 18 =
  26. 26.26 × 12 =
  27. 27.13 × 16 =
  28. 28.35 × 12 =
  29. 29.13 × 24 =
  30. 30.27 × 12 =
  31. 31.40 × 15 =
  32. 32.19 × 14 =
  33. 33.19 × 15 =
  34. 34.25 × 24 =
  35. 35.14 × 18 =
  36. 36.26 × 15 =
  37. 37.40 × 14 =
  38. 38.29 × 15 =
  39. 39.31 × 12 =
  40. 40.16 × 15 =

Answer key

  1. 322
  2. 360
  3. 736
  4. 525
  5. 540
  6. 738
  7. 496
  8. 660
  9. 518
  10. 315
  11. 432
  12. 468
  13. 630
  14. 336
  15. 576
  16. 324
  17. 644
  18. 555
  19. 846
  20. 405
  21. 528
  22. 196
  23. 624
  24. 350
  25. 414
  26. 312
  27. 208
  28. 420
  29. 312
  30. 324
  31. 600
  32. 266
  33. 285
  34. 600
  35. 252
  36. 390
  37. 560
  38. 435
  39. 372
  40. 240

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