Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 613 · 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 × 16 =
2. 2.31 × 24 =
3. 3.26 × 24 =
4. 4.30 × 18 =
5. 5.12 × 14 =
6. 6.48 × 24 =
7. 7.48 × 14 =
8. 8.25 × 16 =
9. 9.14 × 15 =
10. 10.16 × 18 =
11. 11.36 × 15 =
12. 12.36 × 12 =
13. 13.47 × 24 =
14. 14.41 × 24 =
15. 15.40 × 16 =
16. 16.13 × 24 =
17. 17.27 × 12 =
18. 18.23 × 12 =
19. 19.30 × 14 =
20. 20.28 × 14 =
21. 21.42 × 24 =
22. 22.11 × 14 =
23. 23.13 × 12 =
24. 24.33 × 15 =
25. 25.23 × 18 =
26. 26.19 × 15 =
27. 27.37 × 15 =
28. 28.18 × 16 =
29. 29.32 × 12 =
30. 30.28 × 12 =
31. 31.15 × 24 =
32. 32.40 × 24 =
33. 33.41 × 18 =
34. 34.15 × 16 =
35. 35.49 × 24 =
36. 36.43 × 12 =
37. 37.15 × 14 =
38. 38.40 × 14 =
39. 39.16 × 24 =
40. 40.14 × 12 =

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