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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 703 · 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. 1.22 × 14 =
  2. 2.11 × 12 =
  3. 3.12 × 12 =
  4. 4.30 × 18 =
  5. 5.45 × 15 =
  6. 6.49 × 14 =
  7. 7.45 × 12 =
  8. 8.47 × 15 =
  9. 9.27 × 12 =
  10. 10.13 × 12 =
  11. 11.30 × 15 =
  12. 12.33 × 16 =
  13. 13.32 × 12 =
  14. 14.24 × 24 =
  15. 15.26 × 15 =
  16. 16.17 × 24 =
  17. 17.33 × 24 =
  18. 18.12 × 24 =
  19. 19.11 × 14 =
  20. 20.36 × 24 =
  21. 21.26 × 24 =
  22. 22.30 × 14 =
  23. 23.48 × 24 =
  24. 24.32 × 18 =
  25. 25.22 × 12 =
  26. 26.25 × 18 =
  27. 27.25 × 12 =
  28. 28.31 × 16 =
  29. 29.38 × 18 =
  30. 30.35 × 14 =
  31. 31.14 × 12 =
  32. 32.41 × 16 =
  33. 33.38 × 15 =
  34. 34.11 × 18 =
  35. 35.19 × 18 =
  36. 36.37 × 15 =
  37. 37.13 × 15 =
  38. 38.39 × 16 =
  39. 39.36 × 16 =
  40. 40.40 × 24 =

Answer key

  1. 308
  2. 132
  3. 144
  4. 540
  5. 675
  6. 686
  7. 540
  8. 705
  9. 324
  10. 156
  11. 450
  12. 528
  13. 384
  14. 576
  15. 390
  16. 408
  17. 792
  18. 288
  19. 154
  20. 864
  21. 624
  22. 420
  23. 1152
  24. 576
  25. 264
  26. 450
  27. 300
  28. 496
  29. 684
  30. 490
  31. 168
  32. 656
  33. 570
  34. 198
  35. 342
  36. 555
  37. 195
  38. 624
  39. 576
  40. 960

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