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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 533 · 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. 1.22 × 24 =
  2. 2.45 × 14 =
  3. 3.11 × 12 =
  4. 4.13 × 14 =
  5. 5.13 × 16 =
  6. 6.27 × 18 =
  7. 7.44 × 16 =
  8. 8.20 × 16 =
  9. 9.25 × 12 =
  10. 10.18 × 16 =
  11. 11.49 × 12 =
  12. 12.21 × 16 =
  13. 13.40 × 24 =
  14. 14.18 × 12 =
  15. 15.35 × 12 =
  16. 16.21 × 15 =
  17. 17.14 × 24 =
  18. 18.13 × 15 =
  19. 19.46 × 12 =
  20. 20.29 × 15 =
  21. 21.12 × 14 =
  22. 22.16 × 14 =
  23. 23.37 × 24 =
  24. 24.27 × 16 =
  25. 25.11 × 16 =
  26. 26.41 × 24 =
  27. 27.47 × 12 =
  28. 28.33 × 16 =
  29. 29.32 × 15 =
  30. 30.23 × 18 =
  31. 31.41 × 12 =
  32. 32.34 × 24 =
  33. 33.41 × 16 =
  34. 34.30 × 14 =
  35. 35.16 × 15 =
  36. 36.42 × 15 =
  37. 37.17 × 18 =
  38. 38.44 × 14 =
  39. 39.25 × 18 =
  40. 40.17 × 12 =

Answer key

  1. 528
  2. 630
  3. 132
  4. 182
  5. 208
  6. 486
  7. 704
  8. 320
  9. 300
  10. 288
  11. 588
  12. 336
  13. 960
  14. 216
  15. 420
  16. 315
  17. 336
  18. 195
  19. 552
  20. 435
  21. 168
  22. 224
  23. 888
  24. 432
  25. 176
  26. 984
  27. 564
  28. 528
  29. 480
  30. 414
  31. 492
  32. 816
  33. 656
  34. 420
  35. 240
  36. 630
  37. 306
  38. 616
  39. 450
  40. 204

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