Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 346 · 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. 1.20 × 12 =
2. 2.32 × 15 =
3. 3.30 × 14 =
4. 4.47 × 24 =
5. 5.22 × 14 =
6. 6.13 × 16 =
7. 7.32 × 12 =
8. 8.39 × 18 =
9. 9.44 × 24 =
10. 10.17 × 14 =
11. 11.40 × 16 =
12. 12.41 × 24 =
13. 13.25 × 24 =
14. 14.25 × 16 =
15. 15.25 × 14 =
16. 16.23 × 12 =
17. 17.41 × 18 =
18. 18.40 × 15 =
19. 19.18 × 15 =
20. 20.33 × 24 =
21. 21.29 × 16 =
22. 22.21 × 15 =
23. 23.27 × 16 =
24. 24.12 × 18 =
25. 25.29 × 18 =
26. 26.30 × 16 =
27. 27.14 × 14 =
28. 28.43 × 14 =
29. 29.36 × 14 =
30. 30.41 × 12 =
31. 31.30 × 24 =
32. 32.12 × 15 =
33. 33.43 × 15 =
34. 34.15 × 14 =
35. 35.41 × 15 =
36. 36.33 × 15 =
37. 37.36 × 16 =
38. 38.43 × 24 =
39. 39.12 × 16 =
40. 40.45 × 14 =

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