Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 149 · 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. 1.18 × 16 =
2. 2.41 × 14 =
3. 3.38 × 16 =
4. 4.22 × 24 =
5. 5.31 × 24 =
6. 6.21 × 14 =
7. 7.38 × 12 =
8. 8.46 × 15 =
9. 9.17 × 16 =
10. 10.44 × 15 =
11. 11.41 × 12 =
12. 12.21 × 24 =
13. 13.25 × 24 =
14. 14.44 × 12 =
15. 15.48 × 16 =
16. 16.39 × 18 =
17. 17.25 × 14 =
18. 18.25 × 12 =
19. 19.46 × 12 =
20. 20.47 × 24 =
21. 21.30 × 24 =
22. 22.39 × 12 =
23. 23.40 × 14 =
24. 24.12 × 16 =
25. 25.14 × 14 =
26. 26.32 × 14 =
27. 27.37 × 24 =
28. 28.22 × 15 =
29. 29.17 × 14 =
30. 30.16 × 18 =
31. 31.35 × 14 =
32. 32.20 × 16 =
33. 33.25 × 18 =
34. 34.43 × 16 =
35. 35.44 × 16 =
36. 36.16 × 15 =
37. 37.32 × 24 =
38. 38.44 × 24 =
39. 39.20 × 18 =
40. 40.41 × 16 =

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