Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 960 · 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. 1.16 × 12 =
2. 2.36 × 24 =
3. 3.46 × 24 =
4. 4.45 × 14 =
5. 5.11 × 18 =
6. 6.33 × 16 =
7. 7.48 × 18 =
8. 8.13 × 15 =
9. 9.17 × 15 =
10. 10.38 × 12 =
11. 11.20 × 14 =
12. 12.32 × 16 =
13. 13.35 × 16 =
14. 14.16 × 14 =
15. 15.18 × 12 =
16. 16.17 × 16 =
17. 17.29 × 18 =
18. 18.43 × 14 =
19. 19.41 × 16 =
20. 20.15 × 24 =
21. 21.33 × 14 =
22. 22.15 × 18 =
23. 23.35 × 14 =
24. 24.12 × 14 =
25. 25.35 × 18 =
26. 26.17 × 24 =
27. 27.44 × 24 =
28. 28.39 × 15 =
29. 29.40 × 16 =
30. 30.43 × 12 =
31. 31.14 × 12 =
32. 32.39 × 14 =
33. 33.40 × 15 =
34. 34.42 × 18 =
35. 35.35 × 12 =
36. 36.33 × 15 =
37. 37.39 × 18 =
38. 38.22 × 24 =
39. 39.25 × 16 =
40. 40.23 × 18 =

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