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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 349 · 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. 1.40 × 24 =
  2. 2.24 × 15 =
  3. 3.38 × 16 =
  4. 4.18 × 15 =
  5. 5.18 × 14 =
  6. 6.17 × 24 =
  7. 7.25 × 12 =
  8. 8.30 × 24 =
  9. 9.13 × 24 =
  10. 10.21 × 12 =
  11. 11.36 × 15 =
  12. 12.32 × 15 =
  13. 13.30 × 12 =
  14. 14.21 × 15 =
  15. 15.17 × 18 =
  16. 16.11 × 16 =
  17. 17.34 × 24 =
  18. 18.45 × 14 =
  19. 19.14 × 12 =
  20. 20.36 × 12 =
  21. 21.13 × 14 =
  22. 22.37 × 14 =
  23. 23.17 × 15 =
  24. 24.44 × 12 =
  25. 25.49 × 14 =
  26. 26.43 × 12 =
  27. 27.28 × 18 =
  28. 28.47 × 15 =
  29. 29.24 × 24 =
  30. 30.48 × 12 =
  31. 31.40 × 12 =
  32. 32.22 × 24 =
  33. 33.19 × 16 =
  34. 34.21 × 16 =
  35. 35.39 × 12 =
  36. 36.18 × 12 =
  37. 37.45 × 18 =
  38. 38.41 × 15 =
  39. 39.17 × 12 =
  40. 40.38 × 24 =

Answer key

  1. 960
  2. 360
  3. 608
  4. 270
  5. 252
  6. 408
  7. 300
  8. 720
  9. 312
  10. 252
  11. 540
  12. 480
  13. 360
  14. 315
  15. 306
  16. 176
  17. 816
  18. 630
  19. 168
  20. 432
  21. 182
  22. 518
  23. 255
  24. 528
  25. 686
  26. 516
  27. 504
  28. 705
  29. 576
  30. 576
  31. 480
  32. 528
  33. 304
  34. 336
  35. 468
  36. 216
  37. 810
  38. 615
  39. 204
  40. 912

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