Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 714 · 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. 1.12 × 16 =
2. 2.11 × 24 =
3. 3.41 × 18 =
4. 4.48 × 16 =
5. 5.19 × 24 =
6. 6.21 × 24 =
7. 7.41 × 12 =
8. 8.25 × 12 =
9. 9.31 × 18 =
10. 10.28 × 12 =
11. 11.14 × 24 =
12. 12.17 × 15 =
13. 13.13 × 18 =
14. 14.44 × 24 =
15. 15.14 × 16 =
16. 16.16 × 12 =
17. 17.45 × 14 =
18. 18.35 × 16 =
19. 19.24 × 14 =
20. 20.15 × 16 =
21. 21.18 × 12 =
22. 22.11 × 15 =
23. 23.46 × 18 =
24. 24.22 × 24 =
25. 25.25 × 16 =
26. 26.22 × 14 =
27. 27.26 × 24 =
28. 28.32 × 15 =
29. 29.26 × 16 =
30. 30.36 × 16 =
31. 31.22 × 15 =
32. 32.38 × 12 =
33. 33.16 × 15 =
34. 34.42 × 15 =
35. 35.32 × 14 =
36. 36.40 × 12 =
37. 37.28 × 14 =
38. 38.35 × 24 =
39. 39.23 × 12 =
40. 40.23 × 24 =

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