Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 502 · 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. 1.38 × 12 =
2. 2.23 × 18 =
3. 3.48 × 15 =
4. 4.47 × 18 =
5. 5.37 × 12 =
6. 6.11 × 18 =
7. 7.15 × 16 =
8. 8.32 × 16 =
9. 9.35 × 12 =
10. 10.18 × 12 =
11. 11.26 × 14 =
12. 12.28 × 24 =
13. 13.20 × 12 =
14. 14.37 × 16 =
15. 15.17 × 16 =
16. 16.20 × 24 =
17. 17.46 × 12 =
18. 18.36 × 12 =
19. 19.49 × 12 =
20. 20.26 × 15 =
21. 21.25 × 16 =
22. 22.27 × 14 =
23. 23.12 × 16 =
24. 24.47 × 24 =
25. 25.33 × 16 =
26. 26.25 × 24 =
27. 27.44 × 16 =
28. 28.27 × 16 =
29. 29.12 × 15 =
30. 30.16 × 16 =
31. 31.43 × 14 =
32. 32.20 × 18 =
33. 33.24 × 14 =
34. 34.37 × 24 =
35. 35.27 × 18 =
36. 36.21 × 16 =
37. 37.12 × 14 =
38. 38.13 × 18 =
39. 39.27 × 15 =
40. 40.40 × 14 =

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