Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 315 · 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. 1.47 × 14 =
2. 2.24 × 16 =
3. 3.32 × 16 =
4. 4.44 × 24 =
5. 5.49 × 15 =
6. 6.25 × 14 =
7. 7.12 × 18 =
8. 8.21 × 18 =
9. 9.23 × 15 =
10. 10.31 × 15 =
11. 11.46 × 24 =
12. 12.23 × 24 =
13. 13.11 × 24 =
14. 14.48 × 16 =
15. 15.46 × 18 =
16. 16.26 × 24 =
17. 17.21 × 14 =
18. 18.48 × 24 =
19. 19.31 × 14 =
20. 20.29 × 18 =
21. 21.16 × 15 =
22. 22.28 × 12 =
23. 23.17 × 24 =
24. 24.31 × 12 =
25. 25.17 × 16 =
26. 26.11 × 15 =
27. 27.39 × 15 =
28. 28.20 × 14 =
29. 29.34 × 24 =
30. 30.32 × 24 =
31. 31.17 × 18 =
32. 32.36 × 18 =
33. 33.19 × 18 =
34. 34.26 × 15 =
35. 35.29 × 14 =
36. 36.42 × 18 =
37. 37.22 × 16 =
38. 38.49 × 14 =
39. 39.33 × 16 =
40. 40.32 × 18 =

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