Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 633 · 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. 1.43 × 16 =
2. 2.45 × 24 =
3. 3.33 × 14 =
4. 4.45 × 14 =
5. 5.17 × 12 =
6. 6.33 × 24 =
7. 7.29 × 24 =
8. 8.16 × 16 =
9. 9.38 × 12 =
10. 10.43 × 18 =
11. 11.18 × 15 =
12. 12.25 × 14 =
13. 13.37 × 12 =
14. 14.44 × 12 =
15. 15.19 × 15 =
16. 16.34 × 18 =
17. 17.30 × 24 =
18. 18.16 × 12 =
19. 19.43 × 14 =
20. 20.33 × 12 =
21. 21.26 × 14 =
22. 22.27 × 12 =
23. 23.40 × 18 =
24. 24.45 × 12 =
25. 25.29 × 18 =
26. 26.12 × 14 =
27. 27.39 × 16 =
28. 28.22 × 18 =
29. 29.18 × 12 =
30. 30.22 × 12 =
31. 31.24 × 15 =
32. 32.17 × 16 =
33. 33.11 × 12 =
34. 34.15 × 12 =
35. 35.46 × 14 =
36. 36.27 × 16 =
37. 37.44 × 24 =
38. 38.48 × 24 =
39. 39.47 × 18 =
40. 40.49 × 12 =

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