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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 658 · 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. 1.39 × 24 =
  2. 2.31 × 18 =
  3. 3.35 × 16 =
  4. 4.22 × 18 =
  5. 5.27 × 12 =
  6. 6.14 × 16 =
  7. 7.22 × 16 =
  8. 8.37 × 14 =
  9. 9.45 × 12 =
  10. 10.41 × 12 =
  11. 11.24 × 15 =
  12. 12.49 × 12 =
  13. 13.35 × 15 =
  14. 14.16 × 15 =
  15. 15.47 × 14 =
  16. 16.34 × 18 =
  17. 17.34 × 16 =
  18. 18.24 × 18 =
  19. 19.17 × 16 =
  20. 20.11 × 14 =
  21. 21.37 × 24 =
  22. 22.40 × 16 =
  23. 23.44 × 16 =
  24. 24.16 × 24 =
  25. 25.34 × 14 =
  26. 26.26 × 24 =
  27. 27.35 × 14 =
  28. 28.44 × 14 =
  29. 29.35 × 24 =
  30. 30.31 × 16 =
  31. 31.36 × 18 =
  32. 32.20 × 14 =
  33. 33.11 × 24 =
  34. 34.16 × 16 =
  35. 35.40 × 24 =
  36. 36.39 × 15 =
  37. 37.39 × 12 =
  38. 38.31 × 12 =
  39. 39.32 × 24 =
  40. 40.12 × 15 =

Answer key

  1. 936
  2. 558
  3. 560
  4. 396
  5. 324
  6. 224
  7. 352
  8. 518
  9. 540
  10. 492
  11. 360
  12. 588
  13. 525
  14. 240
  15. 658
  16. 612
  17. 544
  18. 432
  19. 272
  20. 154
  21. 888
  22. 640
  23. 704
  24. 384
  25. 476
  26. 624
  27. 490
  28. 616
  29. 840
  30. 496
  31. 648
  32. 280
  33. 264
  34. 256
  35. 960
  36. 585
  37. 468
  38. 372
  39. 768
  40. 180

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