Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 264 · 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. 1.13 × 16 =
2. 2.30 × 18 =
3. 3.26 × 18 =
4. 4.36 × 16 =
5. 5.33 × 16 =
6. 6.45 × 12 =
7. 7.31 × 24 =
8. 8.12 × 12 =
9. 9.48 × 12 =
10. 10.40 × 12 =
11. 11.24 × 18 =
12. 12.49 × 12 =
13. 13.25 × 24 =
14. 14.24 × 12 =
15. 15.21 × 18 =
16. 16.23 × 12 =
17. 17.43 × 15 =
18. 18.15 × 14 =
19. 19.43 × 14 =
20. 20.38 × 16 =
21. 21.17 × 18 =
22. 22.11 × 16 =
23. 23.14 × 12 =
24. 24.17 × 16 =
25. 25.18 × 24 =
26. 26.17 × 12 =
27. 27.20 × 24 =
28. 28.28 × 12 =
29. 29.41 × 14 =
30. 30.44 × 24 =
31. 31.34 × 16 =
32. 32.18 × 12 =
33. 33.25 × 12 =
34. 34.19 × 15 =
35. 35.17 × 14 =
36. 36.44 × 15 =
37. 37.33 × 12 =
38. 38.18 × 18 =
39. 39.24 × 16 =
40. 40.43 × 24 =

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