Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 873 · 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. 1.13 × 14 =
2. 2.21 × 16 =
3. 3.44 × 24 =
4. 4.16 × 15 =
5. 5.20 × 24 =
6. 6.13 × 18 =
7. 7.25 × 24 =
8. 8.46 × 24 =
9. 9.43 × 14 =
10. 10.30 × 16 =
11. 11.27 × 15 =
12. 12.23 × 18 =
13. 13.17 × 18 =
14. 14.39 × 14 =
15. 15.30 × 15 =
16. 16.13 × 24 =
17. 17.49 × 12 =
18. 18.31 × 14 =
19. 19.36 × 16 =
20. 20.15 × 12 =
21. 21.20 × 12 =
22. 22.12 × 24 =
23. 23.16 × 12 =
24. 24.23 × 16 =
25. 25.15 × 15 =
26. 26.34 × 12 =
27. 27.11 × 14 =
28. 28.18 × 24 =
29. 29.30 × 12 =
30. 30.27 × 14 =
31. 31.34 × 16 =
32. 32.18 × 15 =
33. 33.48 × 24 =
34. 34.14 × 14 =
35. 35.31 × 24 =
36. 36.31 × 16 =
37. 37.45 × 16 =
38. 38.37 × 12 =
39. 39.13 × 12 =
40. 40.21 × 24 =

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