Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 928 · 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. 1.23 × 14 =
2. 2.24 × 12 =
3. 3.49 × 24 =
4. 4.12 × 14 =
5. 5.25 × 15 =
6. 6.43 × 16 =
7. 7.17 × 18 =
8. 8.35 × 16 =
9. 9.28 × 16 =
10. 10.30 × 14 =
11. 11.36 × 12 =
12. 12.44 × 15 =
13. 13.23 × 12 =
14. 14.47 × 12 =
15. 15.17 × 24 =
16. 16.33 × 24 =
17. 17.22 × 18 =
18. 18.46 × 12 =
19. 19.42 × 18 =
20. 20.45 × 24 =
21. 21.43 × 14 =
22. 22.24 × 18 =
23. 23.32 × 16 =
24. 24.20 × 14 =
25. 25.21 × 12 =
26. 26.47 × 14 =
27. 27.42 × 15 =
28. 28.29 × 18 =
29. 29.28 × 14 =
30. 30.25 × 18 =
31. 31.45 × 14 =
32. 32.16 × 16 =
33. 33.30 × 15 =
34. 34.32 × 15 =
35. 35.34 × 16 =
36. 36.24 × 14 =
37. 37.26 × 12 =
38. 38.26 × 18 =
39. 39.18 × 18 =
40. 40.43 × 12 =

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