Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 876 · 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. 1.48 × 12 =
2. 2.16 × 16 =
3. 3.21 × 12 =
4. 4.15 × 14 =
5. 5.20 × 16 =
6. 6.46 × 14 =
7. 7.43 × 14 =
8. 8.22 × 12 =
9. 9.31 × 16 =
10. 10.12 × 24 =
11. 11.12 × 12 =
12. 12.16 × 14 =
13. 13.35 × 12 =
14. 14.26 × 15 =
15. 15.49 × 18 =
16. 16.36 × 12 =
17. 17.22 × 14 =
18. 18.34 × 16 =
19. 19.37 × 14 =
20. 20.25 × 18 =
21. 21.39 × 15 =
22. 22.33 × 16 =
23. 23.48 × 15 =
24. 24.40 × 16 =
25. 25.39 × 16 =
26. 26.14 × 12 =
27. 27.25 × 24 =
28. 28.15 × 24 =
29. 29.28 × 16 =
30. 30.23 × 18 =
31. 31.43 × 24 =
32. 32.25 × 15 =
33. 33.30 × 24 =
34. 34.45 × 12 =
35. 35.36 × 18 =
36. 36.32 × 15 =
37. 37.16 × 12 =
38. 38.20 × 18 =
39. 39.34 × 18 =
40. 40.21 × 24 =

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