Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 351 · 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. 1.48 × 16 =
2. 2.16 × 14 =
3. 3.23 × 18 =
4. 4.38 × 14 =
5. 5.30 × 14 =
6. 6.49 × 24 =
7. 7.36 × 12 =
8. 8.13 × 14 =
9. 9.27 × 18 =
10. 10.21 × 14 =
11. 11.28 × 14 =
12. 12.48 × 12 =
13. 13.25 × 16 =
14. 14.25 × 12 =
15. 15.22 × 16 =
16. 16.31 × 15 =
17. 17.34 × 24 =
18. 18.49 × 16 =
19. 19.18 × 14 =
20. 20.45 × 12 =
21. 21.41 × 16 =
22. 22.42 × 12 =
23. 23.41 × 18 =
24. 24.23 × 16 =
25. 25.37 × 24 =
26. 26.42 × 24 =
27. 27.38 × 24 =
28. 28.30 × 24 =
29. 29.20 × 16 =
30. 30.44 × 24 =
31. 31.49 × 14 =
32. 32.11 × 12 =
33. 33.30 × 12 =
34. 34.25 × 14 =
35. 35.43 × 15 =
36. 36.39 × 16 =
37. 37.44 × 14 =
38. 38.44 × 16 =
39. 39.29 × 14 =
40. 40.20 × 24 =

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