Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 949 · 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 × 18 =
2. 2.46 × 12 =
3. 3.32 × 18 =
4. 4.34 × 12 =
5. 5.11 × 16 =
6. 6.25 × 16 =
7. 7.12 × 14 =
8. 8.23 × 16 =
9. 9.33 × 18 =
10. 10.37 × 24 =
11. 11.49 × 16 =
12. 12.38 × 24 =
13. 13.31 × 14 =
14. 14.34 × 16 =
15. 15.46 × 16 =
16. 16.45 × 18 =
17. 17.29 × 18 =
18. 18.18 × 14 =
19. 19.45 × 15 =
20. 20.22 × 16 =
21. 21.11 × 12 =
22. 22.40 × 14 =
23. 23.41 × 18 =
24. 24.36 × 16 =
25. 25.49 × 12 =
26. 26.13 × 18 =
27. 27.22 × 15 =
28. 28.14 × 14 =
29. 29.44 × 14 =
30. 30.33 × 24 =
31. 31.42 × 18 =
32. 32.26 × 15 =
33. 33.48 × 18 =
34. 34.15 × 14 =
35. 35.20 × 15 =
36. 36.38 × 14 =
37. 37.16 × 14 =
38. 38.37 × 14 =
39. 39.17 × 24 =
40. 40.13 × 24 =

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