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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 56 · 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. 1.37 × 12 =
  2. 2.32 × 15 =
  3. 3.29 × 16 =
  4. 4.31 × 14 =
  5. 5.28 × 16 =
  6. 6.19 × 15 =
  7. 7.13 × 12 =
  8. 8.35 × 18 =
  9. 9.31 × 12 =
  10. 10.40 × 15 =
  11. 11.34 × 16 =
  12. 12.14 × 15 =
  13. 13.23 × 24 =
  14. 14.44 × 12 =
  15. 15.13 × 24 =
  16. 16.37 × 14 =
  17. 17.30 × 12 =
  18. 18.17 × 14 =
  19. 19.41 × 24 =
  20. 20.27 × 15 =
  21. 21.14 × 24 =
  22. 22.44 × 14 =
  23. 23.19 × 14 =
  24. 24.44 × 15 =
  25. 25.36 × 24 =
  26. 26.19 × 12 =
  27. 27.38 × 15 =
  28. 28.46 × 12 =
  29. 29.42 × 15 =
  30. 30.29 × 15 =
  31. 31.48 × 15 =
  32. 32.35 × 14 =
  33. 33.11 × 15 =
  34. 34.49 × 18 =
  35. 35.49 × 15 =
  36. 36.47 × 16 =
  37. 37.33 × 24 =
  38. 38.11 × 18 =
  39. 39.29 × 12 =
  40. 40.48 × 12 =

Answer key

  1. 444
  2. 480
  3. 464
  4. 434
  5. 448
  6. 285
  7. 156
  8. 630
  9. 372
  10. 600
  11. 544
  12. 210
  13. 552
  14. 528
  15. 312
  16. 518
  17. 360
  18. 238
  19. 984
  20. 405
  21. 336
  22. 616
  23. 266
  24. 660
  25. 864
  26. 228
  27. 570
  28. 552
  29. 630
  30. 435
  31. 720
  32. 490
  33. 165
  34. 882
  35. 735
  36. 752
  37. 792
  38. 198
  39. 348
  40. 576

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