Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 957 · 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. 1.16 × 24 =
2. 2.25 × 16 =
3. 3.46 × 14 =
4. 4.41 × 12 =
5. 5.22 × 24 =
6. 6.16 × 12 =
7. 7.13 × 18 =
8. 8.21 × 15 =
9. 9.49 × 15 =
10. 10.11 × 15 =
11. 11.44 × 16 =
12. 12.40 × 24 =
13. 13.11 × 16 =
14. 14.23 × 12 =
15. 15.30 × 12 =
16. 16.42 × 18 =
17. 17.49 × 24 =
18. 18.15 × 24 =
19. 19.21 × 12 =
20. 20.19 × 12 =
21. 21.49 × 12 =
22. 22.35 × 12 =
23. 23.31 × 16 =
24. 24.14 × 15 =
25. 25.21 × 16 =
26. 26.32 × 14 =
27. 27.31 × 12 =
28. 28.42 × 12 =
29. 29.19 × 18 =
30. 30.15 × 14 =
31. 31.37 × 15 =
32. 32.42 × 16 =
33. 33.21 × 18 =
34. 34.34 × 15 =
35. 35.24 × 14 =
36. 36.44 × 18 =
37. 37.39 × 14 =
38. 38.34 × 18 =
39. 39.20 × 14 =
40. 40.49 × 14 =

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