Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 979 · 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. 1.43 × 12 =
2. 2.33 × 16 =
3. 3.36 × 24 =
4. 4.34 × 14 =
5. 5.31 × 15 =
6. 6.18 × 15 =
7. 7.21 × 16 =
8. 8.17 × 15 =
9. 9.17 × 24 =
10. 10.47 × 15 =
11. 11.21 × 12 =
12. 12.11 × 24 =
13. 13.29 × 24 =
14. 14.24 × 24 =
15. 15.20 × 14 =
16. 16.45 × 16 =
17. 17.37 × 18 =
18. 18.18 × 14 =
19. 19.37 × 16 =
20. 20.43 × 18 =
21. 21.23 × 15 =
22. 22.43 × 14 =
23. 23.24 × 15 =
24. 24.13 × 12 =
25. 25.38 × 18 =
26. 26.37 × 12 =
27. 27.34 × 15 =
28. 28.40 × 16 =
29. 29.48 × 12 =
30. 30.25 × 15 =
31. 31.47 × 18 =
32. 32.14 × 14 =
33. 33.15 × 24 =
34. 34.15 × 12 =
35. 35.25 × 16 =
36. 36.47 × 16 =
37. 37.29 × 18 =
38. 38.49 × 14 =
39. 39.27 × 15 =
40. 40.26 × 14 =

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