Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 142 · 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. 2.28 × 16 =
3. 3.44 × 14 =
4. 4.28 × 14 =
5. 5.39 × 24 =
6. 6.44 × 12 =
7. 7.24 × 14 =
8. 8.30 × 15 =
9. 9.24 × 16 =
10. 10.21 × 16 =
11. 11.12 × 15 =
12. 12.38 × 16 =
13. 13.15 × 14 =
14. 14.47 × 18 =
15. 15.44 × 16 =
16. 16.39 × 15 =
17. 17.42 × 12 =
18. 18.20 × 12 =
19. 19.25 × 15 =
20. 20.22 × 14 =
21. 21.48 × 12 =
22. 22.43 × 16 =
23. 23.14 × 18 =
24. 24.20 × 16 =
25. 25.40 × 24 =
26. 26.35 × 12 =
27. 27.11 × 15 =
28. 28.17 × 15 =
29. 29.18 × 16 =
30. 30.45 × 18 =
31. 31.31 × 18 =
32. 32.46 × 15 =
33. 33.28 × 12 =
34. 34.47 × 16 =
35. 35.47 × 24 =
36. 36.22 × 18 =
37. 37.44 × 24 =
38. 38.13 × 15 =
39. 39.19 × 16 =
40. 40.18 × 15 =

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