Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 905 · 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. 1.32 × 14 =
2. 2.24 × 14 =
3. 3.20 × 16 =
4. 4.25 × 12 =
5. 5.12 × 12 =
6. 6.29 × 16 =
7. 7.35 × 15 =
8. 8.31 × 15 =
9. 9.24 × 18 =
10. 10.34 × 18 =
11. 11.31 × 18 =
12. 12.22 × 16 =
13. 13.20 × 14 =
14. 14.30 × 14 =
15. 15.13 × 12 =
16. 16.18 × 12 =
17. 17.42 × 12 =
18. 18.41 × 24 =
19. 19.31 × 24 =
20. 20.29 × 24 =
21. 21.44 × 16 =
22. 22.43 × 12 =
23. 23.42 × 14 =
24. 24.41 × 18 =
25. 25.26 × 24 =
26. 26.12 × 16 =
27. 27.39 × 24 =
28. 28.31 × 14 =
29. 29.16 × 15 =
30. 30.37 × 12 =
31. 31.12 × 24 =
32. 32.29 × 15 =
33. 33.44 × 24 =
34. 34.30 × 18 =
35. 35.19 × 24 =
36. 36.15 × 12 =
37. 37.32 × 18 =
38. 38.46 × 18 =
39. 39.23 × 16 =
40. 40.16 × 16 =

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