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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 948 · 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. 1.15 × 16 =
  2. 2.48 × 18 =
  3. 3.30 × 16 =
  4. 4.22 × 12 =
  5. 5.24 × 15 =
  6. 6.11 × 12 =
  7. 7.39 × 12 =
  8. 8.47 × 14 =
  9. 9.14 × 12 =
  10. 10.37 × 15 =
  11. 11.12 × 15 =
  12. 12.46 × 12 =
  13. 13.25 × 16 =
  14. 14.24 × 24 =
  15. 15.17 × 12 =
  16. 16.32 × 12 =
  17. 17.12 × 24 =
  18. 18.25 × 15 =
  19. 19.19 × 12 =
  20. 20.11 × 24 =
  21. 21.38 × 15 =
  22. 22.37 × 16 =
  23. 23.34 × 18 =
  24. 24.44 × 12 =
  25. 25.17 × 14 =
  26. 26.13 × 15 =
  27. 27.41 × 14 =
  28. 28.16 × 16 =
  29. 29.32 × 15 =
  30. 30.17 × 15 =
  31. 31.31 × 14 =
  32. 32.36 × 12 =
  33. 33.20 × 12 =
  34. 34.29 × 12 =
  35. 35.26 × 14 =
  36. 36.40 × 14 =
  37. 37.30 × 14 =
  38. 38.37 × 12 =
  39. 39.41 × 16 =
  40. 40.17 × 24 =

Answer key

  1. 240
  2. 864
  3. 480
  4. 264
  5. 360
  6. 132
  7. 468
  8. 658
  9. 168
  10. 555
  11. 180
  12. 552
  13. 400
  14. 576
  15. 204
  16. 384
  17. 288
  18. 375
  19. 228
  20. 264
  21. 570
  22. 592
  23. 612
  24. 528
  25. 238
  26. 195
  27. 574
  28. 256
  29. 480
  30. 255
  31. 434
  32. 432
  33. 240
  34. 348
  35. 364
  36. 560
  37. 420
  38. 444
  39. 656
  40. 408

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