Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 121 · 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. 1.35 × 16 =
2. 2.14 × 18 =
3. 3.31 × 24 =
4. 4.44 × 12 =
5. 5.41 × 14 =
6. 6.23 × 12 =
7. 7.21 × 24 =
8. 8.37 × 14 =
9. 9.19 × 14 =
10. 10.13 × 12 =
11. 11.49 × 18 =
12. 12.30 × 18 =
13. 13.24 × 18 =
14. 14.46 × 24 =
15. 15.34 × 18 =
16. 16.17 × 12 =
17. 17.18 × 12 =
18. 18.24 × 12 =
19. 19.37 × 18 =
20. 20.42 × 16 =
21. 21.15 × 24 =
22. 22.43 × 14 =
23. 23.41 × 16 =
24. 24.43 × 16 =
25. 25.19 × 18 =
26. 26.45 × 16 =
27. 27.31 × 18 =
28. 28.38 × 14 =
29. 29.29 × 14 =
30. 30.34 × 14 =
31. 31.29 × 15 =
32. 32.39 × 18 =
33. 33.27 × 14 =
34. 34.19 × 24 =
35. 35.22 × 14 =
36. 36.43 × 12 =
37. 37.32 × 24 =
38. 38.14 × 16 =
39. 39.15 × 16 =
40. 40.36 × 24 =

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