Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 854 · 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 × 24 =
2. 2.16 × 14 =
3. 3.23 × 18 =
4. 4.15 × 12 =
5. 5.13 × 18 =
6. 6.33 × 12 =
7. 7.29 × 18 =
8. 8.17 × 16 =
9. 9.20 × 15 =
10. 10.39 × 15 =
11. 11.31 × 18 =
12. 12.25 × 18 =
13. 13.14 × 12 =
14. 14.22 × 24 =
15. 15.48 × 14 =
16. 16.49 × 24 =
17. 17.11 × 14 =
18. 18.30 × 16 =
19. 19.38 × 18 =
20. 20.28 × 24 =
21. 21.36 × 16 =
22. 22.24 × 14 =
23. 23.35 × 16 =
24. 24.42 × 16 =
25. 25.24 × 15 =
26. 26.40 × 14 =
27. 27.13 × 15 =
28. 28.28 × 18 =
29. 29.25 × 24 =
30. 30.47 × 18 =
31. 31.18 × 12 =
32. 32.43 × 16 =
33. 33.48 × 15 =
34. 34.25 × 16 =
35. 35.44 × 12 =
36. 36.40 × 15 =
37. 37.40 × 18 =
38. 38.35 × 12 =
39. 39.14 × 18 =
40. 40.14 × 24 =

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