Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 433 · 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. 1.31 × 16 =
2. 2.26 × 24 =
3. 3.45 × 24 =
4. 4.21 × 18 =
5. 5.48 × 16 =
6. 6.32 × 18 =
7. 7.49 × 16 =
8. 8.43 × 15 =
9. 9.12 × 15 =
10. 10.38 × 24 =
11. 11.16 × 24 =
12. 12.48 × 15 =
13. 13.32 × 24 =
14. 14.46 × 24 =
15. 15.39 × 18 =
16. 16.13 × 24 =
17. 17.36 × 24 =
18. 18.49 × 24 =
19. 19.47 × 24 =
20. 20.48 × 14 =
21. 21.35 × 24 =
22. 22.46 × 15 =
23. 23.17 × 16 =
24. 24.22 × 18 =
25. 25.33 × 14 =
26. 26.46 × 12 =
27. 27.31 × 14 =
28. 28.19 × 16 =
29. 29.45 × 18 =
30. 30.23 × 12 =
31. 31.49 × 12 =
32. 32.18 × 14 =
33. 33.44 × 24 =
34. 34.21 × 16 =
35. 35.48 × 18 =
36. 36.34 × 16 =
37. 37.36 × 15 =
38. 38.43 × 18 =
39. 39.46 × 14 =
40. 40.13 × 15 =

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