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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 789 · 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. 1.13 × 15 =
  2. 2.35 × 12 =
  3. 3.14 × 24 =
  4. 4.36 × 16 =
  5. 5.24 × 14 =
  6. 6.27 × 12 =
  7. 7.45 × 12 =
  8. 8.29 × 18 =
  9. 9.41 × 15 =
  10. 10.25 × 16 =
  11. 11.20 × 16 =
  12. 12.31 × 18 =
  13. 13.44 × 15 =
  14. 14.40 × 16 =
  15. 15.38 × 18 =
  16. 16.19 × 12 =
  17. 17.32 × 15 =
  18. 18.12 × 12 =
  19. 19.34 × 12 =
  20. 20.14 × 16 =
  21. 21.23 × 16 =
  22. 22.11 × 14 =
  23. 23.26 × 18 =
  24. 24.21 × 14 =
  25. 25.24 × 18 =
  26. 26.40 × 24 =
  27. 27.19 × 14 =
  28. 28.48 × 14 =
  29. 29.24 × 12 =
  30. 30.30 × 15 =
  31. 31.25 × 12 =
  32. 32.42 × 16 =
  33. 33.21 × 12 =
  34. 34.34 × 14 =
  35. 35.47 × 15 =
  36. 36.46 × 14 =
  37. 37.26 × 16 =
  38. 38.23 × 24 =
  39. 39.45 × 15 =
  40. 40.47 × 16 =

Answer key

  1. 195
  2. 420
  3. 336
  4. 576
  5. 336
  6. 324
  7. 540
  8. 522
  9. 615
  10. 400
  11. 320
  12. 558
  13. 660
  14. 640
  15. 684
  16. 228
  17. 480
  18. 144
  19. 408
  20. 224
  21. 368
  22. 154
  23. 468
  24. 294
  25. 432
  26. 960
  27. 266
  28. 672
  29. 288
  30. 450
  31. 300
  32. 672
  33. 252
  34. 476
  35. 705
  36. 644
  37. 416
  38. 552
  39. 675
  40. 752

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