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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 519 · 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. 1.14 × 12 =
  2. 2.11 × 15 =
  3. 3.32 × 18 =
  4. 4.16 × 12 =
  5. 5.31 × 24 =
  6. 6.45 × 16 =
  7. 7.38 × 15 =
  8. 8.47 × 15 =
  9. 9.12 × 14 =
  10. 10.37 × 12 =
  11. 11.28 × 14 =
  12. 12.18 × 12 =
  13. 13.47 × 16 =
  14. 14.29 × 15 =
  15. 15.31 × 18 =
  16. 16.13 × 24 =
  17. 17.24 × 24 =
  18. 18.23 × 14 =
  19. 19.48 × 14 =
  20. 20.46 × 16 =
  21. 21.33 × 18 =
  22. 22.46 × 12 =
  23. 23.41 × 15 =
  24. 24.43 × 14 =
  25. 25.41 × 14 =
  26. 26.17 × 14 =
  27. 27.28 × 24 =
  28. 28.11 × 14 =
  29. 29.32 × 14 =
  30. 30.20 × 18 =
  31. 31.35 × 16 =
  32. 32.48 × 18 =
  33. 33.19 × 12 =
  34. 34.32 × 12 =
  35. 35.35 × 24 =
  36. 36.12 × 16 =
  37. 37.11 × 24 =
  38. 38.22 × 12 =
  39. 39.39 × 24 =
  40. 40.29 × 14 =

Answer key

  1. 168
  2. 165
  3. 576
  4. 192
  5. 744
  6. 720
  7. 570
  8. 705
  9. 168
  10. 444
  11. 392
  12. 216
  13. 752
  14. 435
  15. 558
  16. 312
  17. 576
  18. 322
  19. 672
  20. 736
  21. 594
  22. 552
  23. 615
  24. 602
  25. 574
  26. 238
  27. 672
  28. 154
  29. 448
  30. 360
  31. 560
  32. 864
  33. 228
  34. 384
  35. 840
  36. 192
  37. 264
  38. 264
  39. 936
  40. 406

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