Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 671 · 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. 1.22 × 12 =
2. 2.39 × 18 =
3. 3.49 × 14 =
4. 4.14 × 14 =
5. 5.20 × 12 =
6. 6.12 × 15 =
7. 7.14 × 18 =
8. 8.45 × 16 =
9. 9.32 × 15 =
10. 10.40 × 12 =
11. 11.18 × 12 =
12. 12.20 × 15 =
13. 13.24 × 24 =
14. 14.38 × 18 =
15. 15.27 × 15 =
16. 16.13 × 18 =
17. 17.45 × 14 =
18. 18.34 × 16 =
19. 19.38 × 16 =
20. 20.17 × 15 =
21. 21.46 × 15 =
22. 22.17 × 18 =
23. 23.22 × 16 =
24. 24.13 × 16 =
25. 25.41 × 15 =
26. 26.37 × 15 =
27. 27.11 × 14 =
28. 28.18 × 24 =
29. 29.30 × 15 =
30. 30.47 × 14 =
31. 31.23 × 14 =
32. 32.24 × 12 =
33. 33.31 × 12 =
34. 34.34 × 24 =
35. 35.20 × 16 =
36. 36.15 × 24 =
37. 37.32 × 14 =
38. 38.27 × 16 =
39. 39.44 × 24 =
40. 40.13 × 12 =

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