Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 422 · 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. 1.29 × 16 =
2. 2.15 × 18 =
3. 3.36 × 12 =
4. 4.44 × 24 =
5. 5.18 × 24 =
6. 6.23 × 18 =
7. 7.34 × 24 =
8. 8.32 × 18 =
9. 9.21 × 16 =
10. 10.31 × 18 =
11. 11.19 × 24 =
12. 12.32 × 15 =
13. 13.17 × 15 =
14. 14.47 × 12 =
15. 15.31 × 24 =
16. 16.29 × 15 =
17. 17.43 × 15 =
18. 18.36 × 15 =
19. 19.23 × 12 =
20. 20.46 × 24 =
21. 21.40 × 16 =
22. 22.33 × 14 =
23. 23.25 × 16 =
24. 24.45 × 24 =
25. 25.47 × 24 =
26. 26.43 × 16 =
27. 27.40 × 15 =
28. 28.49 × 12 =
29. 29.15 × 24 =
30. 30.31 × 12 =
31. 31.26 × 12 =
32. 32.15 × 12 =
33. 33.13 × 15 =
34. 34.46 × 15 =
35. 35.46 × 14 =
36. 36.47 × 15 =
37. 37.31 × 16 =
38. 38.11 × 14 =
39. 39.37 × 14 =
40. 40.38 × 24 =

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