Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 42 · 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. 1.28 × 12 =
2. 2.29 × 24 =
3. 3.36 × 16 =
4. 4.42 × 16 =
5. 5.45 × 12 =
6. 6.23 × 18 =
7. 7.18 × 12 =
8. 8.44 × 14 =
9. 9.29 × 12 =
10. 10.18 × 15 =
11. 11.46 × 16 =
12. 12.21 × 15 =
13. 13.21 × 12 =
14. 14.20 × 14 =
15. 15.47 × 15 =
16. 16.42 × 14 =
17. 17.20 × 24 =
18. 18.29 × 14 =
19. 19.29 × 18 =
20. 20.21 × 24 =
21. 21.22 × 12 =
22. 22.17 × 24 =
23. 23.42 × 18 =
24. 24.14 × 24 =
25. 25.40 × 16 =
26. 26.42 × 15 =
27. 27.24 × 18 =
28. 28.20 × 16 =
29. 29.33 × 24 =
30. 30.19 × 14 =
31. 31.37 × 24 =
32. 32.34 × 16 =
33. 33.13 × 14 =
34. 34.39 × 15 =
35. 35.20 × 15 =
36. 36.14 × 14 =
37. 37.43 × 12 =
38. 38.41 × 14 =
39. 39.12 × 14 =
40. 40.17 × 12 =

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