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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 89 · 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. 1.25 × 15 =
  2. 2.41 × 15 =
  3. 3.38 × 18 =
  4. 4.22 × 12 =
  5. 5.12 × 12 =
  6. 6.13 × 12 =
  7. 7.23 × 15 =
  8. 8.30 × 24 =
  9. 9.21 × 12 =
  10. 10.18 × 15 =
  11. 11.13 × 18 =
  12. 12.28 × 14 =
  13. 13.24 × 24 =
  14. 14.49 × 14 =
  15. 15.17 × 24 =
  16. 16.12 × 16 =
  17. 17.11 × 16 =
  18. 18.19 × 16 =
  19. 19.30 × 15 =
  20. 20.14 × 14 =
  21. 21.46 × 14 =
  22. 22.35 × 24 =
  23. 23.24 × 16 =
  24. 24.20 × 14 =
  25. 25.41 × 18 =
  26. 26.48 × 16 =
  27. 27.29 × 12 =
  28. 28.25 × 12 =
  29. 29.46 × 15 =
  30. 30.29 × 15 =
  31. 31.19 × 14 =
  32. 32.44 × 16 =
  33. 33.11 × 24 =
  34. 34.31 × 16 =
  35. 35.16 × 16 =
  36. 36.22 × 14 =
  37. 37.39 × 12 =
  38. 38.44 × 14 =
  39. 39.49 × 12 =
  40. 40.45 × 12 =

Answer key

  1. 375
  2. 615
  3. 684
  4. 264
  5. 144
  6. 156
  7. 345
  8. 720
  9. 252
  10. 270
  11. 234
  12. 392
  13. 576
  14. 686
  15. 408
  16. 192
  17. 176
  18. 304
  19. 450
  20. 196
  21. 644
  22. 840
  23. 384
  24. 280
  25. 738
  26. 768
  27. 348
  28. 300
  29. 690
  30. 435
  31. 266
  32. 704
  33. 264
  34. 496
  35. 256
  36. 308
  37. 468
  38. 616
  39. 588
  40. 540

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