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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 401 · 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. 1.29 × 14 =
  2. 2.34 × 15 =
  3. 3.23 × 14 =
  4. 4.47 × 15 =
  5. 5.31 × 14 =
  6. 6.16 × 12 =
  7. 7.14 × 14 =
  8. 8.24 × 14 =
  9. 9.12 × 12 =
  10. 10.49 × 16 =
  11. 11.13 × 16 =
  12. 12.38 × 16 =
  13. 13.22 × 12 =
  14. 14.41 × 15 =
  15. 15.19 × 14 =
  16. 16.29 × 16 =
  17. 17.31 × 18 =
  18. 18.13 × 24 =
  19. 19.41 × 14 =
  20. 20.37 × 12 =
  21. 21.20 × 12 =
  22. 22.41 × 12 =
  23. 23.16 × 24 =
  24. 24.35 × 15 =
  25. 25.46 × 16 =
  26. 26.35 × 12 =
  27. 27.28 × 15 =
  28. 28.43 × 16 =
  29. 29.15 × 12 =
  30. 30.22 × 15 =
  31. 31.22 × 18 =
  32. 32.19 × 24 =
  33. 33.47 × 14 =
  34. 34.28 × 14 =
  35. 35.19 × 16 =
  36. 36.33 × 12 =
  37. 37.30 × 12 =
  38. 38.32 × 12 =
  39. 39.17 × 12 =
  40. 40.30 × 16 =

Answer key

  1. 406
  2. 510
  3. 322
  4. 705
  5. 434
  6. 192
  7. 196
  8. 336
  9. 144
  10. 784
  11. 208
  12. 608
  13. 264
  14. 615
  15. 266
  16. 464
  17. 558
  18. 312
  19. 574
  20. 444
  21. 240
  22. 492
  23. 384
  24. 525
  25. 736
  26. 420
  27. 420
  28. 688
  29. 180
  30. 330
  31. 396
  32. 456
  33. 658
  34. 392
  35. 304
  36. 396
  37. 360
  38. 384
  39. 204
  40. 480

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