Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 171 · 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. 1.18 × 24 =
2. 2.48 × 14 =
3. 3.17 × 12 =
4. 4.42 × 16 =
5. 5.48 × 24 =
6. 6.46 × 14 =
7. 7.42 × 18 =
8. 8.34 × 14 =
9. 9.48 × 12 =
10. 10.17 × 24 =
11. 11.39 × 24 =
12. 12.44 × 18 =
13. 13.27 × 14 =
14. 14.36 × 14 =
15. 15.22 × 12 =
16. 16.15 × 24 =
17. 17.46 × 18 =
18. 18.38 × 24 =
19. 19.42 × 12 =
20. 20.17 × 14 =
21. 21.28 × 15 =
22. 22.42 × 15 =
23. 23.15 × 16 =
24. 24.26 × 16 =
25. 25.17 × 18 =
26. 26.46 × 24 =
27. 27.25 × 12 =
28. 28.45 × 16 =
29. 29.24 × 18 =
30. 30.23 × 12 =
31. 31.12 × 16 =
32. 32.26 × 12 =
33. 33.24 × 24 =
34. 34.16 × 14 =
35. 35.19 × 16 =
36. 36.21 × 15 =
37. 37.13 × 15 =
38. 38.14 × 16 =
39. 39.32 × 12 =
40. 40.27 × 24 =

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