Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 55 · 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. 1.30 × 12 =
2. 2.28 × 12 =
3. 3.43 × 12 =
4. 4.44 × 18 =
5. 5.43 × 18 =
6. 6.21 × 16 =
7. 7.41 × 18 =
8. 8.27 × 18 =
9. 9.38 × 12 =
10. 10.12 × 16 =
11. 11.29 × 16 =
12. 12.44 × 12 =
13. 13.43 × 14 =
14. 14.30 × 15 =
15. 15.49 × 15 =
16. 16.21 × 18 =
17. 17.11 × 14 =
18. 18.44 × 16 =
19. 19.22 × 15 =
20. 20.47 × 14 =
21. 21.16 × 16 =
22. 22.15 × 18 =
23. 23.16 × 12 =
24. 24.17 × 12 =
25. 25.24 × 15 =
26. 26.26 × 16 =
27. 27.42 × 15 =
28. 28.23 × 14 =
29. 29.16 × 18 =
30. 30.11 × 16 =
31. 31.13 × 18 =
32. 32.46 × 18 =
33. 33.37 × 14 =
34. 34.19 × 24 =
35. 35.13 × 24 =
36. 36.28 × 18 =
37. 37.46 × 12 =
38. 38.48 × 24 =
39. 39.12 × 18 =
40. 40.15 × 16 =

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