Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 23 · 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. 1.31 × 12 =
2. 2.20 × 24 =
3. 3.37 × 15 =
4. 4.45 × 14 =
5. 5.24 × 12 =
6. 6.33 × 24 =
7. 7.13 × 16 =
8. 8.44 × 14 =
9. 9.27 × 15 =
10. 10.29 × 24 =
11. 11.39 × 12 =
12. 12.12 × 16 =
13. 13.39 × 24 =
14. 14.12 × 15 =
15. 15.12 × 12 =
16. 16.40 × 16 =
17. 17.28 × 12 =
18. 18.15 × 18 =
19. 19.27 × 16 =
20. 20.39 × 14 =
21. 21.13 × 24 =
22. 22.15 × 24 =
23. 23.46 × 18 =
24. 24.29 × 18 =
25. 25.41 × 18 =
26. 26.49 × 12 =
27. 27.42 × 16 =
28. 28.23 × 14 =
29. 29.38 × 12 =
30. 30.18 × 18 =
31. 31.30 × 16 =
32. 32.36 × 14 =
33. 33.18 × 16 =
34. 34.24 × 15 =
35. 35.27 × 12 =
36. 36.44 × 12 =
37. 37.16 × 18 =
38. 38.35 × 16 =
39. 39.43 × 14 =
40. 40.43 × 16 =

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