Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 608 · 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. 1.26 × 16 =
2. 2.49 × 14 =
3. 3.14 × 18 =
4. 4.38 × 14 =
5. 5.33 × 12 =
6. 6.17 × 14 =
7. 7.42 × 18 =
8. 8.19 × 24 =
9. 9.16 × 16 =
10. 10.22 × 16 =
11. 11.18 × 16 =
12. 12.12 × 14 =
13. 13.37 × 14 =
14. 14.29 × 16 =
15. 15.25 × 18 =
16. 16.38 × 15 =
17. 17.34 × 16 =
18. 18.16 × 18 =
19. 19.21 × 14 =
20. 20.40 × 15 =
21. 21.39 × 16 =
22. 22.28 × 16 =
23. 23.16 × 14 =
24. 24.18 × 12 =
25. 25.43 × 15 =
26. 26.13 × 14 =
27. 27.22 × 24 =
28. 28.44 × 24 =
29. 29.27 × 14 =
30. 30.28 × 15 =
31. 31.19 × 18 =
32. 32.34 × 14 =
33. 33.21 × 12 =
34. 34.11 × 12 =
35. 35.13 × 24 =
36. 36.11 × 24 =
37. 37.30 × 14 =
38. 38.21 × 24 =
39. 39.17 × 15 =
40. 40.34 × 15 =

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