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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 347 · 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. 1.28 × 12 =
  2. 2.13 × 14 =
  3. 3.12 × 12 =
  4. 4.47 × 12 =
  5. 5.24 × 24 =
  6. 6.34 × 24 =
  7. 7.41 × 15 =
  8. 8.12 × 18 =
  9. 9.14 × 16 =
  10. 10.28 × 24 =
  11. 11.12 × 14 =
  12. 12.24 × 14 =
  13. 13.26 × 14 =
  14. 14.20 × 24 =
  15. 15.36 × 14 =
  16. 16.28 × 14 =
  17. 17.45 × 14 =
  18. 18.16 × 12 =
  19. 19.30 × 24 =
  20. 20.20 × 12 =
  21. 21.15 × 18 =
  22. 22.28 × 15 =
  23. 23.23 × 14 =
  24. 24.18 × 16 =
  25. 25.36 × 12 =
  26. 26.25 × 24 =
  27. 27.47 × 15 =
  28. 28.21 × 16 =
  29. 29.19 × 15 =
  30. 30.23 × 16 =
  31. 31.30 × 18 =
  32. 32.19 × 14 =
  33. 33.48 × 24 =
  34. 34.32 × 15 =
  35. 35.15 × 16 =
  36. 36.44 × 16 =
  37. 37.45 × 12 =
  38. 38.49 × 18 =
  39. 39.26 × 12 =
  40. 40.11 × 12 =

Answer key

  1. 336
  2. 182
  3. 144
  4. 564
  5. 576
  6. 816
  7. 615
  8. 216
  9. 224
  10. 672
  11. 168
  12. 336
  13. 364
  14. 480
  15. 504
  16. 392
  17. 630
  18. 192
  19. 720
  20. 240
  21. 270
  22. 420
  23. 322
  24. 288
  25. 432
  26. 600
  27. 705
  28. 336
  29. 285
  30. 368
  31. 540
  32. 266
  33. 1152
  34. 480
  35. 240
  36. 704
  37. 540
  38. 882
  39. 312
  40. 132

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