Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 648 · 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. 1.45 × 12 =
2. 2.38 × 24 =
3. 3.14 × 12 =
4. 4.40 × 15 =
5. 5.42 × 14 =
6. 6.47 × 12 =
7. 7.24 × 18 =
8. 8.44 × 15 =
9. 9.36 × 12 =
10. 10.18 × 12 =
11. 11.25 × 15 =
12. 12.27 × 12 =
13. 13.25 × 16 =
14. 14.26 × 24 =
15. 15.42 × 24 =
16. 16.16 × 24 =
17. 17.18 × 24 =
18. 18.22 × 15 =
19. 19.39 × 24 =
20. 20.21 × 12 =
21. 21.22 × 16 =
22. 22.16 × 16 =
23. 23.30 × 12 =
24. 24.40 × 14 =
25. 25.28 × 18 =
26. 26.32 × 12 =
27. 27.42 × 16 =
28. 28.18 × 15 =
29. 29.15 × 16 =
30. 30.21 × 14 =
31. 31.11 × 16 =
32. 32.13 × 24 =
33. 33.12 × 24 =
34. 34.46 × 16 =
35. 35.23 × 15 =
36. 36.26 × 12 =
37. 37.36 × 15 =
38. 38.46 × 15 =
39. 39.38 × 14 =
40. 40.45 × 16 =

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