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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 11 · 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 × 24 =
  2. 2.37 × 18 =
  3. 3.45 × 14 =
  4. 4.19 × 15 =
  5. 5.23 × 14 =
  6. 6.34 × 14 =
  7. 7.48 × 14 =
  8. 8.15 × 18 =
  9. 9.42 × 14 =
  10. 10.11 × 12 =
  11. 11.18 × 12 =
  12. 12.15 × 16 =
  13. 13.29 × 14 =
  14. 14.11 × 15 =
  15. 15.11 × 14 =
  16. 16.36 × 12 =
  17. 17.38 × 15 =
  18. 18.19 × 12 =
  19. 19.22 × 15 =
  20. 20.16 × 12 =
  21. 21.14 × 24 =
  22. 22.43 × 15 =
  23. 23.32 × 18 =
  24. 24.44 × 15 =
  25. 25.19 × 16 =
  26. 26.29 × 24 =
  27. 27.22 × 14 =
  28. 28.45 × 18 =
  29. 29.23 × 24 =
  30. 30.46 × 14 =
  31. 31.35 × 14 =
  32. 32.41 × 15 =
  33. 33.17 × 15 =
  34. 34.20 × 15 =
  35. 35.41 × 16 =
  36. 36.37 × 15 =
  37. 37.34 × 15 =
  38. 38.42 × 18 =
  39. 39.35 × 12 =
  40. 40.38 × 12 =

Answer key

  1. 600
  2. 666
  3. 630
  4. 285
  5. 322
  6. 476
  7. 672
  8. 270
  9. 588
  10. 132
  11. 216
  12. 240
  13. 406
  14. 165
  15. 154
  16. 432
  17. 570
  18. 228
  19. 330
  20. 192
  21. 336
  22. 645
  23. 576
  24. 660
  25. 304
  26. 696
  27. 308
  28. 810
  29. 552
  30. 644
  31. 490
  32. 615
  33. 255
  34. 300
  35. 656
  36. 555
  37. 510
  38. 756
  39. 420
  40. 456

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