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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 694 · 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. 1.19 × 12 =
  2. 2.31 × 18 =
  3. 3.20 × 15 =
  4. 4.15 × 15 =
  5. 5.23 × 18 =
  6. 6.47 × 15 =
  7. 7.14 × 15 =
  8. 8.12 × 24 =
  9. 9.18 × 14 =
  10. 10.39 × 14 =
  11. 11.18 × 12 =
  12. 12.26 × 16 =
  13. 13.13 × 24 =
  14. 14.37 × 18 =
  15. 15.48 × 16 =
  16. 16.14 × 16 =
  17. 17.31 × 15 =
  18. 18.37 × 16 =
  19. 19.35 × 15 =
  20. 20.32 × 12 =
  21. 21.19 × 16 =
  22. 22.18 × 16 =
  23. 23.48 × 12 =
  24. 24.22 × 15 =
  25. 25.11 × 14 =
  26. 26.13 × 18 =
  27. 27.32 × 18 =
  28. 28.23 × 16 =
  29. 29.26 × 12 =
  30. 30.44 × 18 =
  31. 31.22 × 14 =
  32. 32.20 × 12 =
  33. 33.34 × 14 =
  34. 34.24 × 24 =
  35. 35.36 × 12 =
  36. 36.18 × 24 =
  37. 37.12 × 15 =
  38. 38.48 × 15 =
  39. 39.19 × 24 =
  40. 40.30 × 18 =

Answer key

  1. 228
  2. 558
  3. 300
  4. 225
  5. 414
  6. 705
  7. 210
  8. 288
  9. 252
  10. 546
  11. 216
  12. 416
  13. 312
  14. 666
  15. 768
  16. 224
  17. 465
  18. 592
  19. 525
  20. 384
  21. 304
  22. 288
  23. 576
  24. 330
  25. 154
  26. 234
  27. 576
  28. 368
  29. 312
  30. 792
  31. 308
  32. 240
  33. 476
  34. 576
  35. 432
  36. 432
  37. 180
  38. 720
  39. 456
  40. 540

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