Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 237 · 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 × 12 =
2. 2.42 × 14 =
3. 3.36 × 16 =
4. 4.15 × 15 =
5. 5.33 × 12 =
6. 6.14 × 12 =
7. 7.29 × 24 =
8. 8.44 × 12 =
9. 9.11 × 14 =
10. 10.43 × 15 =
11. 11.17 × 18 =
12. 12.20 × 18 =
13. 13.17 × 12 =
14. 14.31 × 12 =
15. 15.41 × 15 =
16. 16.24 × 18 =
17. 17.18 × 14 =
18. 18.26 × 15 =
19. 19.18 × 15 =
20. 20.44 × 14 =
21. 21.26 × 12 =
22. 22.27 × 14 =
23. 23.25 × 15 =
24. 24.49 × 14 =
25. 25.24 × 12 =
26. 26.18 × 12 =
27. 27.13 × 14 =
28. 28.25 × 16 =
29. 29.11 × 24 =
30. 30.21 × 15 =
31. 31.47 × 24 =
32. 32.21 × 12 =
33. 33.27 × 16 =
34. 34.43 × 14 =
35. 35.15 × 14 =
36. 36.12 × 24 =
37. 37.11 × 15 =
38. 38.35 × 12 =
39. 39.35 × 16 =
40. 40.35 × 14 =

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