Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 41 · 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. 1.43 × 14 =
2. 2.45 × 18 =
3. 3.28 × 18 =
4. 4.46 × 14 =
5. 5.22 × 24 =
6. 6.42 × 12 =
7. 7.12 × 14 =
8. 8.32 × 18 =
9. 9.36 × 24 =
10. 10.33 × 24 =
11. 11.24 × 24 =
12. 12.47 × 12 =
13. 13.20 × 16 =
14. 14.18 × 12 =
15. 15.43 × 15 =
16. 16.26 × 24 =
17. 17.40 × 14 =
18. 18.18 × 18 =
19. 19.27 × 15 =
20. 20.17 × 12 =
21. 21.32 × 12 =
22. 22.24 × 15 =
23. 23.11 × 12 =
24. 24.14 × 12 =
25. 25.29 × 16 =
26. 26.24 × 14 =
27. 27.30 × 24 =
28. 28.44 × 14 =
29. 29.25 × 14 =
30. 30.44 × 12 =
31. 31.22 × 14 =
32. 32.22 × 16 =
33. 33.28 × 24 =
34. 34.34 × 24 =
35. 35.40 × 16 =
36. 36.23 × 12 =
37. 37.37 × 14 =
38. 38.49 × 16 =
39. 39.15 × 14 =
40. 40.45 × 24 =

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