Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 999 · 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. 2.33 × 12 =
3. 3.46 × 16 =
4. 4.18 × 14 =
5. 5.40 × 15 =
6. 6.17 × 18 =
7. 7.26 × 24 =
8. 8.25 × 15 =
9. 9.35 × 12 =
10. 10.29 × 12 =
11. 11.49 × 14 =
12. 12.15 × 18 =
13. 13.43 × 18 =
14. 14.18 × 12 =
15. 15.17 × 14 =
16. 16.11 × 15 =
17. 17.28 × 12 =
18. 18.16 × 16 =
19. 19.38 × 12 =
20. 20.19 × 24 =
21. 21.42 × 12 =
22. 22.11 × 16 =
23. 23.22 × 16 =
24. 24.47 × 12 =
25. 25.42 × 15 =
26. 26.47 × 15 =
27. 27.45 × 14 =
28. 28.21 × 14 =
29. 29.42 × 16 =
30. 30.44 × 16 =
31. 31.12 × 15 =
32. 32.39 × 18 =
33. 33.23 × 18 =
34. 34.45 × 24 =
35. 35.37 × 16 =
36. 36.13 × 14 =
37. 37.27 × 12 =
38. 38.46 × 12 =
39. 39.34 × 14 =
40. 40.26 × 16 =

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