Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 390 · 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. 1.28 × 16 =
2. 2.16 × 12 =
3. 3.30 × 14 =
4. 4.13 × 14 =
5. 5.14 × 12 =
6. 6.11 × 12 =
7. 7.22 × 14 =
8. 8.47 × 14 =
9. 9.35 × 16 =
10. 10.37 × 15 =
11. 11.35 × 12 =
12. 12.47 × 15 =
13. 13.12 × 12 =
14. 14.42 × 16 =
15. 15.26 × 12 =
16. 16.22 × 18 =
17. 17.49 × 14 =
18. 18.15 × 18 =
19. 19.43 × 24 =
20. 20.41 × 12 =
21. 21.12 × 14 =
22. 22.20 × 24 =
23. 23.45 × 12 =
24. 24.12 × 15 =
25. 25.13 × 24 =
26. 26.23 × 14 =
27. 27.41 × 14 =
28. 28.46 × 16 =
29. 29.44 × 18 =
30. 30.11 × 14 =
31. 31.38 × 15 =
32. 32.18 × 12 =
33. 33.23 × 12 =
34. 34.18 × 14 =
35. 35.49 × 15 =
36. 36.21 × 18 =
37. 37.24 × 14 =
38. 38.43 × 18 =
39. 39.42 × 14 =
40. 40.19 × 15 =

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