Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 186 · 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. 1.29 × 18 =
2. 2.26 × 16 =
3. 3.42 × 18 =
4. 4.36 × 24 =
5. 5.46 × 14 =
6. 6.34 × 14 =
7. 7.11 × 12 =
8. 8.38 × 12 =
9. 9.16 × 18 =
10. 10.27 × 15 =
11. 11.11 × 15 =
12. 12.25 × 12 =
13. 13.21 × 24 =
14. 14.34 × 24 =
15. 15.17 × 24 =
16. 16.31 × 24 =
17. 17.27 × 12 =
18. 18.29 × 24 =
19. 19.11 × 14 =
20. 20.30 × 24 =
21. 21.24 × 12 =
22. 22.13 × 12 =
23. 23.41 × 18 =
24. 24.32 × 16 =
25. 25.20 × 15 =
26. 26.36 × 14 =
27. 27.43 × 14 =
28. 28.39 × 24 =
29. 29.18 × 18 =
30. 30.21 × 12 =
31. 31.33 × 14 =
32. 32.30 × 14 =
33. 33.36 × 18 =
34. 34.37 × 12 =
35. 35.29 × 12 =
36. 36.39 × 14 =
37. 37.27 × 14 =
38. 38.16 × 15 =
39. 39.40 × 14 =
40. 40.25 × 14 =

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