Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 380 · 40 questions

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).

1. 1.11 × 14 =
2. 2.26 × 12 =
3. 3.16 × 12 =
4. 4.37 × 15 =
5. 5.38 × 14 =
6. 6.36 × 18 =
7. 7.31 × 14 =
8. 8.13 × 16 =
9. 9.46 × 14 =
10. 10.16 × 14 =
11. 11.44 × 16 =
12. 12.41 × 18 =
13. 13.20 × 14 =
14. 14.15 × 12 =
15. 15.40 × 12 =
16. 16.49 × 15 =
17. 17.22 × 24 =
18. 18.22 × 16 =
19. 19.27 × 12 =
20. 20.37 × 14 =
21. 21.42 × 18 =
22. 22.43 × 15 =
23. 23.19 × 16 =
24. 24.18 × 24 =
25. 25.21 × 24 =
26. 26.14 × 14 =
27. 27.38 × 18 =
28. 28.25 × 15 =
29. 29.33 × 24 =
30. 30.24 × 12 =
31. 31.13 × 24 =
32. 32.31 × 24 =
33. 33.35 × 14 =
34. 34.23 × 18 =
35. 35.15 × 14 =
36. 36.48 × 14 =
37. 37.13 × 12 =
38. 38.18 × 16 =
39. 39.37 × 18 =
40. 40.27 × 14 =

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