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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 285 · 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 × 15 =
  2. 2.46 × 14 =
  3. 3.37 × 12 =
  4. 4.42 × 12 =
  5. 5.19 × 12 =
  6. 6.36 × 24 =
  7. 7.41 × 14 =
  8. 8.20 × 24 =
  9. 9.39 × 12 =
  10. 10.32 × 16 =
  11. 11.40 × 24 =
  12. 12.23 × 24 =
  13. 13.48 × 14 =
  14. 14.16 × 12 =
  15. 15.32 × 24 =
  16. 16.27 × 12 =
  17. 17.16 × 15 =
  18. 18.49 × 18 =
  19. 19.29 × 14 =
  20. 20.44 × 16 =
  21. 21.12 × 16 =
  22. 22.19 × 16 =
  23. 23.15 × 14 =
  24. 24.42 × 16 =
  25. 25.26 × 24 =
  26. 26.28 × 14 =
  27. 27.13 × 14 =
  28. 28.11 × 16 =
  29. 29.38 × 16 =
  30. 30.29 × 12 =
  31. 31.30 × 12 =
  32. 32.34 × 16 =
  33. 33.15 × 15 =
  34. 34.47 × 18 =
  35. 35.18 × 24 =
  36. 36.43 × 15 =
  37. 37.34 × 24 =
  38. 38.35 × 18 =
  39. 39.11 × 14 =
  40. 40.13 × 24 =

Answer key

  1. 585
  2. 644
  3. 444
  4. 504
  5. 228
  6. 864
  7. 574
  8. 480
  9. 468
  10. 512
  11. 960
  12. 552
  13. 672
  14. 192
  15. 768
  16. 324
  17. 240
  18. 882
  19. 406
  20. 704
  21. 192
  22. 304
  23. 210
  24. 672
  25. 624
  26. 392
  27. 182
  28. 176
  29. 608
  30. 348
  31. 360
  32. 544
  33. 225
  34. 846
  35. 432
  36. 645
  37. 816
  38. 630
  39. 154
  40. 312

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