Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 989 · 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. 1.46 × 18 =
2. 2.27 × 15 =
3. 3.45 × 12 =
4. 4.43 × 18 =
5. 5.48 × 14 =
6. 6.12 × 14 =
7. 7.27 × 24 =
8. 8.37 × 16 =
9. 9.25 × 14 =
10. 10.13 × 18 =
11. 11.41 × 16 =
12. 12.23 × 15 =
13. 13.37 × 15 =
14. 14.15 × 15 =
15. 15.31 × 12 =
16. 16.11 × 18 =
17. 17.13 × 24 =
18. 18.49 × 16 =
19. 19.23 × 14 =
20. 20.13 × 15 =
21. 21.13 × 14 =
22. 22.36 × 18 =
23. 23.41 × 24 =
24. 24.21 × 15 =
25. 25.20 × 14 =
26. 26.43 × 15 =
27. 27.25 × 16 =
28. 28.48 × 24 =
29. 29.42 × 24 =
30. 30.25 × 12 =
31. 31.23 × 18 =
32. 32.31 × 14 =
33. 33.46 × 12 =
34. 34.35 × 24 =
35. 35.36 × 15 =
36. 36.17 × 12 =
37. 37.29 × 18 =
38. 38.39 × 16 =
39. 39.44 × 14 =
40. 40.23 × 24 =

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