Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 805 · 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. 1.16 × 14 =
2. 2.17 × 24 =
3. 3.12 × 15 =
4. 4.11 × 24 =
5. 5.24 × 24 =
6. 6.49 × 16 =
7. 7.17 × 18 =
8. 8.29 × 16 =
9. 9.38 × 14 =
10. 10.38 × 16 =
11. 11.34 × 14 =
12. 12.15 × 18 =
13. 13.26 × 12 =
14. 14.49 × 14 =
15. 15.23 × 12 =
16. 16.44 × 18 =
17. 17.32 × 14 =
18. 18.15 × 24 =
19. 19.20 × 12 =
20. 20.16 × 24 =
21. 21.32 × 18 =
22. 22.11 × 12 =
23. 23.33 × 12 =
24. 24.48 × 18 =
25. 25.31 × 15 =
26. 26.24 × 16 =
27. 27.16 × 15 =
28. 28.27 × 18 =
29. 29.42 × 16 =
30. 30.17 × 14 =
31. 31.36 × 18 =
32. 32.16 × 12 =
33. 33.21 × 15 =
34. 34.32 × 24 =
35. 35.15 × 15 =
36. 36.14 × 14 =
37. 37.45 × 12 =
38. 38.19 × 18 =
39. 39.47 × 24 =
40. 40.28 × 15 =

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