Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 783 · 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. 1.19 × 16 =
2. 2.37 × 16 =
3. 3.32 × 16 =
4. 4.28 × 15 =
5. 5.40 × 15 =
6. 6.39 × 18 =
7. 7.15 × 14 =
8. 8.21 × 18 =
9. 9.29 × 16 =
10. 10.33 × 15 =
11. 11.49 × 15 =
12. 12.38 × 24 =
13. 13.45 × 12 =
14. 14.40 × 24 =
15. 15.42 × 16 =
16. 16.26 × 12 =
17. 17.38 × 15 =
18. 18.12 × 15 =
19. 19.19 × 12 =
20. 20.48 × 15 =
21. 21.14 × 12 =
22. 22.11 × 12 =
23. 23.14 × 16 =
24. 24.20 × 15 =
25. 25.36 × 15 =
26. 26.19 × 15 =
27. 27.22 × 14 =
28. 28.14 × 14 =
29. 29.36 × 16 =
30. 30.33 × 24 =
31. 31.31 × 12 =
32. 32.47 × 24 =
33. 33.14 × 24 =
34. 34.47 × 12 =
35. 35.13 × 12 =
36. 36.32 × 15 =
37. 37.25 × 14 =
38. 38.36 × 24 =
39. 39.16 × 16 =
40. 40.47 × 16 =

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