Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 423 · 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. 1.32 × 24 =
2. 2.41 × 24 =
3. 3.45 × 16 =
4. 4.40 × 15 =
5. 5.32 × 18 =
6. 6.28 × 14 =
7. 7.31 × 16 =
8. 8.22 × 12 =
9. 9.14 × 12 =
10. 10.20 × 14 =
11. 11.22 × 16 =
12. 12.13 × 24 =
13. 13.15 × 16 =
14. 14.11 × 14 =
15. 15.17 × 18 =
16. 16.44 × 14 =
17. 17.24 × 16 =
18. 18.19 × 14 =
19. 19.12 × 24 =
20. 20.21 × 18 =
21. 21.35 × 18 =
22. 22.23 × 14 =
23. 23.47 × 18 =
24. 24.45 × 14 =
25. 25.41 × 12 =
26. 26.21 × 15 =
27. 27.42 × 18 =
28. 28.28 × 24 =
29. 29.45 × 15 =
30. 30.26 × 24 =
31. 31.12 × 16 =
32. 32.40 × 12 =
33. 33.42 × 24 =
34. 34.40 × 16 =
35. 35.17 × 16 =
36. 36.28 × 16 =
37. 37.34 × 24 =
38. 38.40 × 24 =
39. 39.41 × 15 =
40. 40.19 × 24 =

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