Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 77 · 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. 1.28 × 24 =
2. 2.46 × 24 =
3. 3.42 × 14 =
4. 4.25 × 24 =
5. 5.25 × 16 =
6. 6.29 × 15 =
7. 7.38 × 15 =
8. 8.14 × 14 =
9. 9.34 × 14 =
10. 10.45 × 24 =
11. 11.44 × 18 =
12. 12.44 × 24 =
13. 13.40 × 14 =
14. 14.15 × 14 =
15. 15.32 × 12 =
16. 16.29 × 18 =
17. 17.11 × 24 =
18. 18.28 × 15 =
19. 19.21 × 18 =
20. 20.26 × 18 =
21. 21.21 × 16 =
22. 22.38 × 12 =
23. 23.11 × 15 =
24. 24.30 × 16 =
25. 25.31 × 14 =
26. 26.13 × 18 =
27. 27.47 × 15 =
28. 28.45 × 18 =
29. 29.38 × 24 =
30. 30.20 × 12 =
31. 31.22 × 24 =
32. 32.21 × 24 =
33. 33.36 × 24 =
34. 34.47 × 14 =
35. 35.27 × 12 =
36. 36.49 × 24 =
37. 37.43 × 12 =
38. 38.34 × 16 =
39. 39.23 × 18 =
40. 40.31 × 12 =

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