Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 126 · 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 × 24 =
3. 3.26 × 16 =
4. 4.12 × 12 =
5. 5.16 × 18 =
6. 6.12 × 18 =
7. 7.43 × 16 =
8. 8.20 × 18 =
9. 9.32 × 12 =
10. 10.34 × 14 =
11. 11.29 × 15 =
12. 12.27 × 12 =
13. 13.44 × 12 =
14. 14.28 × 24 =
15. 15.28 × 12 =
16. 16.18 × 16 =
17. 17.12 × 14 =
18. 18.13 × 12 =
19. 19.34 × 24 =
20. 20.22 × 14 =
21. 21.31 × 15 =
22. 22.21 × 12 =
23. 23.15 × 18 =
24. 24.41 × 14 =
25. 25.29 × 24 =
26. 26.35 × 12 =
27. 27.37 × 12 =
28. 28.11 × 16 =
29. 29.25 × 16 =
30. 30.48 × 12 =
31. 31.47 × 14 =
32. 32.46 × 24 =
33. 33.38 × 12 =
34. 34.22 × 24 =
35. 35.17 × 18 =
36. 36.34 × 16 =
37. 37.16 × 15 =
38. 38.33 × 24 =
39. 39.17 × 14 =
40. 40.19 × 12 =

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