Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 191 · 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. 1.13 × 14 =
2. 2.32 × 14 =
3. 3.32 × 15 =
4. 4.29 × 16 =
5. 5.41 × 15 =
6. 6.20 × 12 =
7. 7.18 × 24 =
8. 8.40 × 24 =
9. 9.15 × 14 =
10. 10.19 × 18 =
11. 11.17 × 14 =
12. 12.41 × 24 =
13. 13.15 × 12 =
14. 14.43 × 15 =
15. 15.11 × 16 =
16. 16.38 × 18 =
17. 17.30 × 14 =
18. 18.44 × 12 =
19. 19.40 × 18 =
20. 20.22 × 12 =
21. 21.31 × 12 =
22. 22.42 × 18 =
23. 23.49 × 15 =
24. 24.27 × 14 =
25. 25.25 × 16 =
26. 26.45 × 16 =
27. 27.43 × 12 =
28. 28.19 × 14 =
29. 29.48 × 16 =
30. 30.17 × 16 =
31. 31.14 × 12 =
32. 32.14 × 18 =
33. 33.36 × 16 =
34. 34.12 × 14 =
35. 35.19 × 12 =
36. 36.18 × 15 =
37. 37.37 × 18 =
38. 38.32 × 24 =
39. 39.11 × 18 =
40. 40.14 × 14 =

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