Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 629 · 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. 2.37 × 24 =
3. 3.38 × 12 =
4. 4.28 × 12 =
5. 5.13 × 15 =
6. 6.40 × 12 =
7. 7.15 × 24 =
8. 8.43 × 12 =
9. 9.49 × 12 =
10. 10.34 × 18 =
11. 11.39 × 16 =
12. 12.12 × 14 =
13. 13.18 × 16 =
14. 14.18 × 12 =
15. 15.39 × 15 =
16. 16.39 × 14 =
17. 17.32 × 15 =
18. 18.29 × 18 =
19. 19.47 × 12 =
20. 20.46 × 14 =
21. 21.45 × 18 =
22. 22.11 × 15 =
23. 23.17 × 14 =
24. 24.28 × 14 =
25. 25.40 × 14 =
26. 26.27 × 16 =
27. 27.20 × 14 =
28. 28.16 × 14 =
29. 29.19 × 14 =
30. 30.49 × 24 =
31. 31.36 × 24 =
32. 32.49 × 15 =
33. 33.37 × 15 =
34. 34.45 × 14 =
35. 35.46 × 18 =
36. 36.17 × 24 =
37. 37.41 × 16 =
38. 38.16 × 18 =
39. 39.16 × 15 =
40. 40.34 × 16 =

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