Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 790 · 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. 1.30 × 16 =
2. 2.16 × 16 =
3. 3.12 × 14 =
4. 4.41 × 12 =
5. 5.18 × 24 =
6. 6.37 × 16 =
7. 7.21 × 24 =
8. 8.21 × 18 =
9. 9.26 × 24 =
10. 10.43 × 14 =
11. 11.16 × 15 =
12. 12.18 × 14 =
13. 13.48 × 15 =
14. 14.19 × 16 =
15. 15.23 × 24 =
16. 16.11 × 14 =
17. 17.21 × 14 =
18. 18.43 × 18 =
19. 19.30 × 15 =
20. 20.21 × 16 =
21. 21.13 × 12 =
22. 22.44 × 15 =
23. 23.32 × 16 =
24. 24.25 × 14 =
25. 25.40 × 16 =
26. 26.11 × 12 =
27. 27.37 × 12 =
28. 28.28 × 12 =
29. 29.15 × 15 =
30. 30.24 × 15 =
31. 31.30 × 14 =
32. 32.13 × 16 =
33. 33.22 × 14 =
34. 34.38 × 16 =
35. 35.43 × 24 =
36. 36.27 × 24 =
37. 37.47 × 12 =
38. 38.12 × 12 =
39. 39.31 × 15 =
40. 40.17 × 14 =

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