Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 328 · 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. 1.20 × 18 =
2. 2.17 × 16 =
3. 3.48 × 24 =
4. 4.14 × 16 =
5. 5.16 × 14 =
6. 6.43 × 18 =
7. 7.17 × 15 =
8. 8.47 × 12 =
9. 9.34 × 18 =
10. 10.31 × 18 =
11. 11.35 × 12 =
12. 12.45 × 14 =
13. 13.42 × 18 =
14. 14.18 × 14 =
15. 15.31 × 15 =
16. 16.11 × 14 =
17. 17.11 × 15 =
18. 18.49 × 18 =
19. 19.32 × 18 =
20. 20.32 × 24 =
21. 21.22 × 16 =
22. 22.13 × 24 =
23. 23.36 × 14 =
24. 24.11 × 16 =
25. 25.45 × 16 =
26. 26.33 × 16 =
27. 27.41 × 15 =
28. 28.35 × 16 =
29. 29.40 × 14 =
30. 30.34 × 12 =
31. 31.15 × 14 =
32. 32.37 × 15 =
33. 33.34 × 16 =
34. 34.47 × 24 =
35. 35.36 × 24 =
36. 36.19 × 16 =
37. 37.36 × 16 =
38. 38.28 × 16 =
39. 39.49 × 14 =
40. 40.29 × 12 =

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