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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 360 · 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. 1.44 × 12 =
  2. 2.47 × 12 =
  3. 3.13 × 15 =
  4. 4.43 × 15 =
  5. 5.16 × 14 =
  6. 6.18 × 16 =
  7. 7.28 × 12 =
  8. 8.45 × 15 =
  9. 9.17 × 18 =
  10. 10.35 × 16 =
  11. 11.30 × 12 =
  12. 12.49 × 14 =
  13. 13.27 × 14 =
  14. 14.34 × 12 =
  15. 15.23 × 12 =
  16. 16.47 × 18 =
  17. 17.19 × 16 =
  18. 18.26 × 15 =
  19. 19.16 × 15 =
  20. 20.30 × 18 =
  21. 21.14 × 14 =
  22. 22.34 × 24 =
  23. 23.25 × 24 =
  24. 24.40 × 16 =
  25. 25.27 × 15 =
  26. 26.26 × 16 =
  27. 27.36 × 16 =
  28. 28.17 × 16 =
  29. 29.14 × 18 =
  30. 30.20 × 16 =
  31. 31.14 × 24 =
  32. 32.33 × 12 =
  33. 33.34 × 14 =
  34. 34.38 × 16 =
  35. 35.17 × 12 =
  36. 36.45 × 18 =
  37. 37.13 × 18 =
  38. 38.15 × 18 =
  39. 39.31 × 14 =
  40. 40.14 × 16 =

Answer key

  1. 528
  2. 564
  3. 195
  4. 645
  5. 224
  6. 288
  7. 336
  8. 675
  9. 306
  10. 560
  11. 360
  12. 686
  13. 378
  14. 408
  15. 276
  16. 846
  17. 304
  18. 390
  19. 240
  20. 540
  21. 196
  22. 816
  23. 600
  24. 640
  25. 405
  26. 416
  27. 576
  28. 272
  29. 252
  30. 320
  31. 336
  32. 396
  33. 476
  34. 608
  35. 204
  36. 810
  37. 234
  38. 270
  39. 434
  40. 224

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