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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 726 · 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. 1.21 × 14 =
  2. 2.22 × 14 =
  3. 3.43 × 12 =
  4. 4.46 × 12 =
  5. 5.48 × 12 =
  6. 6.37 × 14 =
  7. 7.17 × 18 =
  8. 8.23 × 12 =
  9. 9.36 × 14 =
  10. 10.21 × 24 =
  11. 11.34 × 12 =
  12. 12.34 × 16 =
  13. 13.33 × 24 =
  14. 14.28 × 24 =
  15. 15.16 × 15 =
  16. 16.35 × 15 =
  17. 17.17 × 14 =
  18. 18.49 × 18 =
  19. 19.28 × 18 =
  20. 20.14 × 16 =
  21. 21.19 × 24 =
  22. 22.33 × 15 =
  23. 23.38 × 18 =
  24. 24.38 × 12 =
  25. 25.43 × 14 =
  26. 26.25 × 15 =
  27. 27.42 × 18 =
  28. 28.30 × 12 =
  29. 29.24 × 14 =
  30. 30.32 × 24 =
  31. 31.23 × 14 =
  32. 32.11 × 24 =
  33. 33.24 × 12 =
  34. 34.44 × 18 =
  35. 35.32 × 16 =
  36. 36.39 × 18 =
  37. 37.47 × 18 =
  38. 38.46 × 18 =
  39. 39.40 × 15 =
  40. 40.13 × 12 =

Answer key

  1. 294
  2. 308
  3. 516
  4. 552
  5. 576
  6. 518
  7. 306
  8. 276
  9. 504
  10. 504
  11. 408
  12. 544
  13. 792
  14. 672
  15. 240
  16. 525
  17. 238
  18. 882
  19. 504
  20. 224
  21. 456
  22. 495
  23. 684
  24. 456
  25. 602
  26. 375
  27. 756
  28. 360
  29. 336
  30. 768
  31. 322
  32. 264
  33. 288
  34. 792
  35. 512
  36. 702
  37. 846
  38. 828
  39. 600
  40. 156

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