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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 996 · 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. 1.17 × 18 =
  2. 2.25 × 15 =
  3. 3.38 × 14 =
  4. 4.35 × 24 =
  5. 5.29 × 14 =
  6. 6.20 × 16 =
  7. 7.31 × 12 =
  8. 8.28 × 12 =
  9. 9.27 × 16 =
  10. 10.45 × 16 =
  11. 11.35 × 14 =
  12. 12.11 × 14 =
  13. 13.19 × 24 =
  14. 14.37 × 15 =
  15. 15.17 × 16 =
  16. 16.14 × 16 =
  17. 17.28 × 24 =
  18. 18.17 × 24 =
  19. 19.24 × 14 =
  20. 20.39 × 24 =
  21. 21.34 × 18 =
  22. 22.49 × 15 =
  23. 23.46 × 14 =
  24. 24.26 × 24 =
  25. 25.30 × 16 =
  26. 26.40 × 15 =
  27. 27.34 × 15 =
  28. 28.27 × 24 =
  29. 29.21 × 12 =
  30. 30.14 × 12 =
  31. 31.36 × 24 =
  32. 32.45 × 15 =
  33. 33.11 × 18 =
  34. 34.38 × 12 =
  35. 35.40 × 18 =
  36. 36.15 × 18 =
  37. 37.13 × 15 =
  38. 38.36 × 18 =
  39. 39.48 × 12 =
  40. 40.20 × 18 =

Answer key

  1. 306
  2. 375
  3. 532
  4. 840
  5. 406
  6. 320
  7. 372
  8. 336
  9. 432
  10. 720
  11. 490
  12. 154
  13. 456
  14. 555
  15. 272
  16. 224
  17. 672
  18. 408
  19. 336
  20. 936
  21. 612
  22. 735
  23. 644
  24. 624
  25. 480
  26. 600
  27. 510
  28. 648
  29. 252
  30. 168
  31. 864
  32. 675
  33. 198
  34. 456
  35. 720
  36. 270
  37. 195
  38. 648
  39. 576
  40. 360

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