Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 946 · 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. 1.35 × 14 =
2. 2.39 × 16 =
3. 3.39 × 24 =
4. 4.24 × 14 =
5. 5.26 × 16 =
6. 6.42 × 12 =
7. 7.46 × 12 =
8. 8.45 × 16 =
9. 9.28 × 18 =
10. 10.24 × 12 =
11. 11.13 × 18 =
12. 12.48 × 24 =
13. 13.39 × 15 =
14. 14.27 × 14 =
15. 15.39 × 14 =
16. 16.16 × 18 =
17. 17.27 × 16 =
18. 18.37 × 24 =
19. 19.30 × 24 =
20. 20.34 × 16 =
21. 21.44 × 15 =
22. 22.12 × 24 =
23. 23.12 × 16 =
24. 24.24 × 18 =
25. 25.24 × 15 =
26. 26.31 × 16 =
27. 27.34 × 12 =
28. 28.16 × 12 =
29. 29.49 × 14 =
30. 30.47 × 14 =
31. 31.30 × 18 =
32. 32.36 × 18 =
33. 33.34 × 24 =
34. 34.25 × 18 =
35. 35.48 × 15 =
36. 36.21 × 18 =
37. 37.27 × 18 =
38. 38.32 × 12 =
39. 39.29 × 18 =
40. 40.33 × 16 =

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