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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 243 · 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. 1.42 × 12 =
  2. 2.11 × 16 =
  3. 3.18 × 18 =
  4. 4.18 × 16 =
  5. 5.20 × 16 =
  6. 6.15 × 24 =
  7. 7.21 × 18 =
  8. 8.38 × 15 =
  9. 9.30 × 18 =
  10. 10.42 × 14 =
  11. 11.27 × 16 =
  12. 12.32 × 18 =
  13. 13.37 × 14 =
  14. 14.39 × 14 =
  15. 15.44 × 12 =
  16. 16.49 × 14 =
  17. 17.32 × 16 =
  18. 18.44 × 14 =
  19. 19.20 × 14 =
  20. 20.24 × 14 =
  21. 21.24 × 16 =
  22. 22.32 × 15 =
  23. 23.41 × 12 =
  24. 24.12 × 24 =
  25. 25.26 × 12 =
  26. 26.17 × 24 =
  27. 27.14 × 12 =
  28. 28.28 × 18 =
  29. 29.38 × 16 =
  30. 30.35 × 24 =
  31. 31.20 × 15 =
  32. 32.25 × 16 =
  33. 33.26 × 14 =
  34. 34.11 × 12 =
  35. 35.14 × 24 =
  36. 36.41 × 15 =
  37. 37.47 × 18 =
  38. 38.30 × 12 =
  39. 39.38 × 14 =
  40. 40.11 × 14 =

Answer key

  1. 504
  2. 176
  3. 324
  4. 288
  5. 320
  6. 360
  7. 378
  8. 570
  9. 540
  10. 588
  11. 432
  12. 576
  13. 518
  14. 546
  15. 528
  16. 686
  17. 512
  18. 616
  19. 280
  20. 336
  21. 384
  22. 480
  23. 492
  24. 288
  25. 312
  26. 408
  27. 168
  28. 504
  29. 608
  30. 840
  31. 300
  32. 400
  33. 364
  34. 132
  35. 336
  36. 615
  37. 846
  38. 360
  39. 532
  40. 154

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