Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 734 · 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. 1.16 × 12 =
2. 2.29 × 16 =
3. 3.34 × 14 =
4. 4.43 × 18 =
5. 5.16 × 18 =
6. 6.38 × 15 =
7. 7.37 × 24 =
8. 8.38 × 18 =
9. 9.48 × 18 =
10. 10.47 × 18 =
11. 11.22 × 15 =
12. 12.26 × 15 =
13. 13.32 × 12 =
14. 14.28 × 18 =
15. 15.30 × 24 =
16. 16.18 × 15 =
17. 17.47 × 12 =
18. 18.49 × 24 =
19. 19.15 × 12 =
20. 20.30 × 18 =
21. 21.44 × 15 =
22. 22.42 × 14 =
23. 23.12 × 16 =
24. 24.23 × 16 =
25. 25.12 × 14 =
26. 26.21 × 16 =
27. 27.29 × 15 =
28. 28.49 × 14 =
29. 29.14 × 14 =
30. 30.46 × 15 =
31. 31.44 × 24 =
32. 32.12 × 12 =
33. 33.16 × 15 =
34. 34.40 × 18 =
35. 35.39 × 12 =
36. 36.26 × 12 =
37. 37.33 × 12 =
38. 38.13 × 12 =
39. 39.15 × 24 =
40. 40.34 × 24 =

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