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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 669 · 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. 1.36 × 14 =
  2. 2.33 × 16 =
  3. 3.40 × 12 =
  4. 4.17 × 24 =
  5. 5.36 × 15 =
  6. 6.45 × 15 =
  7. 7.14 × 24 =
  8. 8.21 × 14 =
  9. 9.35 × 18 =
  10. 10.29 × 16 =
  11. 11.48 × 18 =
  12. 12.41 × 18 =
  13. 13.44 × 18 =
  14. 14.19 × 16 =
  15. 15.16 × 14 =
  16. 16.47 × 18 =
  17. 17.34 × 16 =
  18. 18.12 × 14 =
  19. 19.14 × 16 =
  20. 20.16 × 24 =
  21. 21.21 × 15 =
  22. 22.25 × 18 =
  23. 23.20 × 14 =
  24. 24.23 × 18 =
  25. 25.15 × 24 =
  26. 26.20 × 15 =
  27. 27.29 × 24 =
  28. 28.47 × 12 =
  29. 29.13 × 12 =
  30. 30.36 × 18 =
  31. 31.21 × 16 =
  32. 32.16 × 15 =
  33. 33.30 × 15 =
  34. 34.23 × 24 =
  35. 35.24 × 16 =
  36. 36.15 × 14 =
  37. 37.39 × 12 =
  38. 38.37 × 14 =
  39. 39.43 × 24 =
  40. 40.14 × 14 =

Answer key

  1. 504
  2. 528
  3. 480
  4. 408
  5. 540
  6. 675
  7. 336
  8. 294
  9. 630
  10. 464
  11. 864
  12. 738
  13. 792
  14. 304
  15. 224
  16. 846
  17. 544
  18. 168
  19. 224
  20. 384
  21. 315
  22. 450
  23. 280
  24. 414
  25. 360
  26. 300
  27. 696
  28. 564
  29. 156
  30. 648
  31. 336
  32. 240
  33. 450
  34. 552
  35. 384
  36. 210
  37. 468
  38. 518
  39. 1032
  40. 196

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