Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 765 · 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. 1.14 × 16 =
2. 2.12 × 15 =
3. 3.13 × 12 =
4. 4.41 × 18 =
5. 5.42 × 15 =
6. 6.37 × 24 =
7. 7.27 × 15 =
8. 8.41 × 14 =
9. 9.45 × 12 =
10. 10.39 × 24 =
11. 11.32 × 14 =
12. 12.14 × 18 =
13. 13.23 × 24 =
14. 14.36 × 24 =
15. 15.16 × 16 =
16. 16.48 × 14 =
17. 17.32 × 15 =
18. 18.31 × 16 =
19. 19.34 × 14 =
20. 20.20 × 12 =
21. 21.35 × 12 =
22. 22.37 × 15 =
23. 23.45 × 24 =
24. 24.44 × 12 =
25. 25.36 × 18 =
26. 26.41 × 24 =
27. 27.18 × 24 =
28. 28.29 × 12 =
29. 29.17 × 14 =
30. 30.33 × 15 =
31. 31.37 × 16 =
32. 32.35 × 18 =
33. 33.15 × 12 =
34. 34.29 × 14 =
35. 35.44 × 15 =
36. 36.16 × 18 =
37. 37.28 × 16 =
38. 38.38 × 24 =
39. 39.22 × 18 =
40. 40.19 × 15 =

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