Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 883 · 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. 1.24 × 12 =
2. 2.28 × 14 =
3. 3.27 × 12 =
4. 4.46 × 15 =
5. 5.11 × 12 =
6. 6.48 × 12 =
7. 7.38 × 15 =
8. 8.45 × 12 =
9. 9.48 × 16 =
10. 10.13 × 12 =
11. 11.39 × 12 =
12. 12.22 × 14 =
13. 13.43 × 12 =
14. 14.12 × 14 =
15. 15.22 × 15 =
16. 16.15 × 15 =
17. 17.15 × 14 =
18. 18.25 × 24 =
19. 19.31 × 12 =
20. 20.37 × 12 =
21. 21.20 × 15 =
22. 22.28 × 12 =
23. 23.16 × 14 =
24. 24.42 × 18 =
25. 25.44 × 16 =
26. 26.28 × 24 =
27. 27.36 × 15 =
28. 28.37 × 14 =
29. 29.31 × 18 =
30. 30.17 × 16 =
31. 31.43 × 18 =
32. 32.35 × 14 =
33. 33.22 × 24 =
34. 34.18 × 14 =
35. 35.12 × 12 =
36. 36.25 × 15 =
37. 37.22 × 16 =
38. 38.15 × 12 =
39. 39.23 × 18 =
40. 40.39 × 18 =

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