Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 368 · 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. 1.22 × 24 =
2. 2.43 × 14 =
3. 3.46 × 12 =
4. 4.13 × 14 =
5. 5.26 × 24 =
6. 6.18 × 18 =
7. 7.32 × 16 =
8. 8.11 × 12 =
9. 9.36 × 14 =
10. 10.44 × 12 =
11. 11.36 × 15 =
12. 12.40 × 15 =
13. 13.29 × 14 =
14. 14.12 × 12 =
15. 15.40 × 14 =
16. 16.39 × 18 =
17. 17.21 × 15 =
18. 18.37 × 16 =
19. 19.16 × 12 =
20. 20.14 × 14 =
21. 21.38 × 16 =
22. 22.28 × 14 =
23. 23.35 × 24 =
24. 24.43 × 18 =
25. 25.44 × 24 =
26. 26.13 × 18 =
27. 27.27 × 15 =
28. 28.20 × 24 =
29. 29.44 × 15 =
30. 30.16 × 16 =
31. 31.33 × 16 =
32. 32.39 × 15 =
33. 33.22 × 14 =
34. 34.37 × 12 =
35. 35.31 × 24 =
36. 36.11 × 14 =
37. 37.49 × 16 =
38. 38.29 × 12 =
39. 39.45 × 15 =
40. 40.26 × 16 =

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