Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 975 · 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. 1.12 × 12 =
2. 2.46 × 18 =
3. 3.42 × 15 =
4. 4.43 × 16 =
5. 5.31 × 14 =
6. 6.49 × 18 =
7. 7.40 × 14 =
8. 8.15 × 14 =
9. 9.47 × 12 =
10. 10.18 × 16 =
11. 11.38 × 24 =
12. 12.48 × 16 =
13. 13.40 × 12 =
14. 14.22 × 14 =
15. 15.18 × 12 =
16. 16.46 × 16 =
17. 17.17 × 24 =
18. 18.25 × 16 =
19. 19.33 × 24 =
20. 20.29 × 16 =
21. 21.20 × 15 =
22. 22.23 × 15 =
23. 23.33 × 14 =
24. 24.35 × 24 =
25. 25.41 × 14 =
26. 26.49 × 14 =
27. 27.22 × 12 =
28. 28.12 × 24 =
29. 29.33 × 12 =
30. 30.31 × 18 =
31. 31.32 × 15 =
32. 32.13 × 24 =
33. 33.26 × 16 =
34. 34.13 × 16 =
35. 35.33 × 16 =
36. 36.28 × 24 =
37. 37.48 × 12 =
38. 38.32 × 14 =
39. 39.45 × 16 =
40. 40.20 × 14 =

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