Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 639 · 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. 1.14 × 12 =
2. 2.18 × 16 =
3. 3.34 × 16 =
4. 4.40 × 24 =
5. 5.21 × 16 =
6. 6.15 × 15 =
7. 7.17 × 12 =
8. 8.26 × 18 =
9. 9.12 × 16 =
10. 10.30 × 18 =
11. 11.11 × 16 =
12. 12.11 × 12 =
13. 13.41 × 24 =
14. 14.25 × 24 =
15. 15.15 × 14 =
16. 16.40 × 16 =
17. 17.13 × 14 =
18. 18.24 × 15 =
19. 19.13 × 15 =
20. 20.20 × 12 =
21. 21.30 × 14 =
22. 22.16 × 14 =
23. 23.49 × 15 =
24. 24.29 × 16 =
25. 25.39 × 24 =
26. 26.42 × 24 =
27. 27.17 × 16 =
28. 28.48 × 12 =
29. 29.27 × 14 =
30. 30.19 × 14 =
31. 31.47 × 18 =
32. 32.23 × 15 =
33. 33.40 × 15 =
34. 34.37 × 12 =
35. 35.22 × 12 =
36. 36.21 × 14 =
37. 37.13 × 18 =
38. 38.18 × 24 =
39. 39.25 × 15 =
40. 40.46 × 14 =

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