Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 908 · 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. 1.24 × 16 =
2. 2.12 × 15 =
3. 3.47 × 12 =
4. 4.43 × 24 =
5. 5.30 × 15 =
6. 6.15 × 16 =
7. 7.32 × 14 =
8. 8.36 × 14 =
9. 9.22 × 15 =
10. 10.35 × 16 =
11. 11.47 × 15 =
12. 12.27 × 12 =
13. 13.13 × 16 =
14. 14.23 × 16 =
15. 15.21 × 24 =
16. 16.43 × 16 =
17. 17.47 × 14 =
18. 18.48 × 12 =
19. 19.32 × 18 =
20. 20.35 × 12 =
21. 21.41 × 24 =
22. 22.23 × 24 =
23. 23.40 × 16 =
24. 24.16 × 18 =
25. 25.36 × 18 =
26. 26.26 × 12 =
27. 27.13 × 14 =
28. 28.40 × 14 =
29. 29.15 × 18 =
30. 30.39 × 16 =
31. 31.21 × 12 =
32. 32.40 × 15 =
33. 33.32 × 16 =
34. 34.45 × 16 =
35. 35.19 × 24 =
36. 36.32 × 15 =
37. 37.42 × 24 =
38. 38.25 × 18 =
39. 39.39 × 12 =
40. 40.47 × 18 =

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