Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 442 · 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. 1.17 × 16 =
2. 2.23 × 15 =
3. 3.25 × 12 =
4. 4.39 × 18 =
5. 5.18 × 14 =
6. 6.24 × 12 =
7. 7.35 × 15 =
8. 8.21 × 15 =
9. 9.13 × 24 =
10. 10.38 × 16 =
11. 11.30 × 24 =
12. 12.41 × 15 =
13. 13.42 × 12 =
14. 14.11 × 18 =
15. 15.25 × 16 =
16. 16.34 × 16 =
17. 17.37 × 15 =
18. 18.27 × 16 =
19. 19.15 × 18 =
20. 20.41 × 12 =
21. 21.39 × 14 =
22. 22.13 × 15 =
23. 23.42 × 15 =
24. 24.17 × 15 =
25. 25.13 × 12 =
26. 26.33 × 16 =
27. 27.23 × 16 =
28. 28.16 × 16 =
29. 29.30 × 14 =
30. 30.12 × 16 =
31. 31.24 × 24 =
32. 32.36 × 12 =
33. 33.17 × 14 =
34. 34.27 × 15 =
35. 35.41 × 16 =
36. 36.40 × 24 =
37. 37.11 × 14 =
38. 38.27 × 12 =
39. 39.14 × 16 =
40. 40.13 × 14 =

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