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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 798 · 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. 1.47 × 16 =
  2. 2.47 × 15 =
  3. 3.39 × 15 =
  4. 4.40 × 12 =
  5. 5.26 × 24 =
  6. 6.27 × 18 =
  7. 7.24 × 14 =
  8. 8.44 × 12 =
  9. 9.22 × 18 =
  10. 10.43 × 16 =
  11. 11.14 × 14 =
  12. 12.19 × 12 =
  13. 13.25 × 16 =
  14. 14.17 × 16 =
  15. 15.36 × 15 =
  16. 16.23 × 12 =
  17. 17.32 × 16 =
  18. 18.41 × 24 =
  19. 19.39 × 24 =
  20. 20.22 × 24 =
  21. 21.22 × 14 =
  22. 22.32 × 15 =
  23. 23.40 × 18 =
  24. 24.12 × 16 =
  25. 25.11 × 15 =
  26. 26.14 × 16 =
  27. 27.34 × 24 =
  28. 28.48 × 18 =
  29. 29.36 × 16 =
  30. 30.11 × 18 =
  31. 31.29 × 16 =
  32. 32.20 × 14 =
  33. 33.49 × 18 =
  34. 34.34 × 16 =
  35. 35.25 × 12 =
  36. 36.49 × 15 =
  37. 37.13 × 15 =
  38. 38.32 × 12 =
  39. 39.27 × 24 =
  40. 40.21 × 15 =

Answer key

  1. 752
  2. 705
  3. 585
  4. 480
  5. 624
  6. 486
  7. 336
  8. 528
  9. 396
  10. 688
  11. 196
  12. 228
  13. 400
  14. 272
  15. 540
  16. 276
  17. 512
  18. 984
  19. 936
  20. 528
  21. 308
  22. 480
  23. 720
  24. 192
  25. 165
  26. 224
  27. 816
  28. 864
  29. 576
  30. 198
  31. 464
  32. 280
  33. 882
  34. 544
  35. 300
  36. 735
  37. 195
  38. 384
  39. 648
  40. 315

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