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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 878 · 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. 1.20 × 24 =
  2. 2.17 × 12 =
  3. 3.47 × 14 =
  4. 4.12 × 16 =
  5. 5.17 × 14 =
  6. 6.46 × 12 =
  7. 7.42 × 12 =
  8. 8.26 × 18 =
  9. 9.35 × 16 =
  10. 10.14 × 16 =
  11. 11.32 × 12 =
  12. 12.11 × 12 =
  13. 13.37 × 18 =
  14. 14.28 × 15 =
  15. 15.32 × 16 =
  16. 16.25 × 24 =
  17. 17.15 × 16 =
  18. 18.18 × 12 =
  19. 19.16 × 16 =
  20. 20.11 × 16 =
  21. 21.30 × 15 =
  22. 22.26 × 14 =
  23. 23.22 × 24 =
  24. 24.17 × 15 =
  25. 25.40 × 16 =
  26. 26.44 × 15 =
  27. 27.25 × 16 =
  28. 28.39 × 14 =
  29. 29.28 × 14 =
  30. 30.41 × 14 =
  31. 31.49 × 14 =
  32. 32.21 × 18 =
  33. 33.25 × 14 =
  34. 34.44 × 12 =
  35. 35.41 × 16 =
  36. 36.13 × 18 =
  37. 37.12 × 12 =
  38. 38.20 × 16 =
  39. 39.30 × 24 =
  40. 40.22 × 16 =

Answer key

  1. 480
  2. 204
  3. 658
  4. 192
  5. 238
  6. 552
  7. 504
  8. 468
  9. 560
  10. 224
  11. 384
  12. 132
  13. 666
  14. 420
  15. 512
  16. 600
  17. 240
  18. 216
  19. 256
  20. 176
  21. 450
  22. 364
  23. 528
  24. 255
  25. 640
  26. 660
  27. 400
  28. 546
  29. 392
  30. 574
  31. 686
  32. 378
  33. 350
  34. 528
  35. 656
  36. 234
  37. 144
  38. 320
  39. 720
  40. 352

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