Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 715 · 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. 1.19 × 12 =
2. 2.23 × 14 =
3. 3.48 × 24 =
4. 4.48 × 18 =
5. 5.22 × 14 =
6. 6.24 × 18 =
7. 7.12 × 12 =
8. 8.47 × 18 =
9. 9.31 × 18 =
10. 10.25 × 15 =
11. 11.17 × 12 =
12. 12.16 × 15 =
13. 13.21 × 24 =
14. 14.17 × 15 =
15. 15.23 × 12 =
16. 16.36 × 18 =
17. 17.18 × 24 =
18. 18.32 × 24 =
19. 19.11 × 16 =
20. 20.20 × 14 =
21. 21.12 × 15 =
22. 22.17 × 24 =
23. 23.39 × 16 =
24. 24.45 × 16 =
25. 25.43 × 24 =
26. 26.37 × 12 =
27. 27.13 × 14 =
28. 28.43 × 12 =
29. 29.18 × 12 =
30. 30.44 × 24 =
31. 31.38 × 24 =
32. 32.14 × 15 =
33. 33.32 × 15 =
34. 34.20 × 18 =
35. 35.19 × 16 =
36. 36.13 × 24 =
37. 37.26 × 18 =
38. 38.44 × 14 =
39. 39.29 × 12 =
40. 40.35 × 16 =

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