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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 196 · 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. 1.39 × 24 =
  2. 2.13 × 24 =
  3. 3.44 × 12 =
  4. 4.23 × 18 =
  5. 5.17 × 15 =
  6. 6.11 × 12 =
  7. 7.13 × 15 =
  8. 8.29 × 15 =
  9. 9.11 × 15 =
  10. 10.31 × 12 =
  11. 11.14 × 14 =
  12. 12.14 × 24 =
  13. 13.11 × 14 =
  14. 14.19 × 14 =
  15. 15.22 × 24 =
  16. 16.30 × 14 =
  17. 17.42 × 15 =
  18. 18.15 × 12 =
  19. 19.20 × 15 =
  20. 20.24 × 12 =
  21. 21.38 × 12 =
  22. 22.45 × 12 =
  23. 23.28 × 24 =
  24. 24.44 × 15 =
  25. 25.42 × 16 =
  26. 26.35 × 14 =
  27. 27.26 × 12 =
  28. 28.46 × 18 =
  29. 29.34 × 14 =
  30. 30.31 × 14 =
  31. 31.25 × 24 =
  32. 32.26 × 15 =
  33. 33.41 × 12 =
  34. 34.16 × 14 =
  35. 35.44 × 18 =
  36. 36.13 × 12 =
  37. 37.47 × 18 =
  38. 38.32 × 18 =
  39. 39.24 × 14 =
  40. 40.36 × 16 =

Answer key

  1. 936
  2. 312
  3. 528
  4. 414
  5. 255
  6. 132
  7. 195
  8. 435
  9. 165
  10. 372
  11. 196
  12. 336
  13. 154
  14. 266
  15. 528
  16. 420
  17. 630
  18. 180
  19. 300
  20. 288
  21. 456
  22. 540
  23. 672
  24. 660
  25. 672
  26. 490
  27. 312
  28. 828
  29. 476
  30. 434
  31. 600
  32. 390
  33. 492
  34. 224
  35. 792
  36. 156
  37. 846
  38. 576
  39. 336
  40. 576

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