Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 739 · 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. 1.28 × 16 =
2. 2.48 × 18 =
3. 3.33 × 15 =
4. 4.19 × 16 =
5. 5.13 × 12 =
6. 6.20 × 15 =
7. 7.41 × 14 =
8. 8.32 × 18 =
9. 9.43 × 14 =
10. 10.40 × 18 =
11. 11.20 × 16 =
12. 12.49 × 14 =
13. 13.43 × 15 =
14. 14.29 × 16 =
15. 15.35 × 18 =
16. 16.40 × 12 =
17. 17.26 × 16 =
18. 18.15 × 18 =
19. 19.37 × 24 =
20. 20.40 × 16 =
21. 21.14 × 24 =
22. 22.41 × 15 =
23. 23.26 × 12 =
24. 24.24 × 16 =
25. 25.11 × 15 =
26. 26.19 × 18 =
27. 27.49 × 16 =
28. 28.21 × 12 =
29. 29.46 × 24 =
30. 30.42 × 12 =
31. 31.33 × 16 =
32. 32.44 × 18 =
33. 33.46 × 14 =
34. 34.24 × 18 =
35. 35.17 × 18 =
36. 36.47 × 18 =
37. 37.29 × 14 =
38. 38.18 × 14 =
39. 39.22 × 12 =
40. 40.25 × 16 =

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