Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 194 · 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. 2.48 × 12 =
3. 3.39 × 18 =
4. 4.41 × 18 =
5. 5.14 × 16 =
6. 6.14 × 14 =
7. 7.24 × 15 =
8. 8.29 × 16 =
9. 9.24 × 12 =
10. 10.29 × 18 =
11. 11.34 × 12 =
12. 12.21 × 24 =
13. 13.47 × 14 =
14. 14.41 × 24 =
15. 15.45 × 24 =
16. 16.11 × 15 =
17. 17.39 × 16 =
18. 18.38 × 12 =
19. 19.18 × 12 =
20. 20.37 × 12 =
21. 21.25 × 15 =
22. 22.34 × 24 =
23. 23.32 × 24 =
24. 24.48 × 15 =
25. 25.20 × 14 =
26. 26.31 × 24 =
27. 27.19 × 15 =
28. 28.18 × 24 =
29. 29.13 × 18 =
30. 30.27 × 24 =
31. 31.33 × 15 =
32. 32.42 × 16 =
33. 33.23 × 24 =
34. 34.47 × 12 =
35. 35.15 × 24 =
36. 36.21 × 18 =
37. 37.42 × 14 =
38. 38.32 × 16 =
39. 39.41 × 15 =
40. 40.20 × 15 =

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