Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 660 · 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. 1.36 × 12 =
2. 2.28 × 12 =
3. 3.18 × 24 =
4. 4.21 × 18 =
5. 5.25 × 24 =
6. 6.41 × 14 =
7. 7.22 × 14 =
8. 8.22 × 18 =
9. 9.35 × 14 =
10. 10.26 × 24 =
11. 11.15 × 12 =
12. 12.25 × 12 =
13. 13.16 × 18 =
14. 14.23 × 15 =
15. 15.38 × 24 =
16. 16.18 × 16 =
17. 17.44 × 18 =
18. 18.49 × 18 =
19. 19.13 × 14 =
20. 20.44 × 15 =
21. 21.32 × 12 =
22. 22.43 × 18 =
23. 23.45 × 24 =
24. 24.21 × 16 =
25. 25.38 × 18 =
26. 26.20 × 24 =
27. 27.35 × 18 =
28. 28.20 × 16 =
29. 29.42 × 24 =
30. 30.45 × 15 =
31. 31.23 × 24 =
32. 32.32 × 18 =
33. 33.42 × 18 =
34. 34.16 × 16 =
35. 35.21 × 15 =
36. 36.23 × 14 =
37. 37.11 × 16 =
38. 38.14 × 18 =
39. 39.15 × 16 =
40. 40.14 × 14 =

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