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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 218 · 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. 1.17 × 12 =
  2. 2.15 × 16 =
  3. 3.25 × 14 =
  4. 4.21 × 15 =
  5. 5.17 × 14 =
  6. 6.41 × 15 =
  7. 7.12 × 18 =
  8. 8.34 × 12 =
  9. 9.37 × 16 =
  10. 10.44 × 14 =
  11. 11.48 × 14 =
  12. 12.30 × 15 =
  13. 13.11 × 16 =
  14. 14.26 × 14 =
  15. 15.13 × 16 =
  16. 16.45 × 16 =
  17. 17.37 × 12 =
  18. 18.36 × 24 =
  19. 19.30 × 24 =
  20. 20.31 × 14 =
  21. 21.42 × 12 =
  22. 22.28 × 15 =
  23. 23.23 × 16 =
  24. 24.36 × 12 =
  25. 25.13 × 12 =
  26. 26.13 × 18 =
  27. 27.34 × 18 =
  28. 28.44 × 15 =
  29. 29.26 × 12 =
  30. 30.11 × 15 =
  31. 31.35 × 12 =
  32. 32.43 × 12 =
  33. 33.16 × 16 =
  34. 34.14 × 24 =
  35. 35.18 × 12 =
  36. 36.28 × 16 =
  37. 37.11 × 12 =
  38. 38.40 × 15 =
  39. 39.12 × 16 =
  40. 40.21 × 14 =

Answer key

  1. 204
  2. 240
  3. 350
  4. 315
  5. 238
  6. 615
  7. 216
  8. 408
  9. 592
  10. 616
  11. 672
  12. 450
  13. 176
  14. 364
  15. 208
  16. 720
  17. 444
  18. 864
  19. 720
  20. 434
  21. 504
  22. 420
  23. 368
  24. 432
  25. 156
  26. 234
  27. 612
  28. 660
  29. 312
  30. 165
  31. 420
  32. 516
  33. 256
  34. 336
  35. 216
  36. 448
  37. 132
  38. 600
  39. 192
  40. 294

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