Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 209 · 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 × 14 =
2. 2.19 × 16 =
3. 3.13 × 12 =
4. 4.44 × 15 =
5. 5.14 × 12 =
6. 6.24 × 16 =
7. 7.11 × 16 =
8. 8.16 × 16 =
9. 9.13 × 15 =
10. 10.44 × 14 =
11. 11.40 × 12 =
12. 12.27 × 14 =
13. 13.18 × 24 =
14. 14.47 × 15 =
15. 15.46 × 18 =
16. 16.43 × 24 =
17. 17.23 × 14 =
18. 18.17 × 18 =
19. 19.22 × 18 =
20. 20.39 × 12 =
21. 21.49 × 16 =
22. 22.47 × 24 =
23. 23.37 × 12 =
24. 24.17 × 14 =
25. 25.45 × 24 =
26. 26.27 × 15 =
27. 27.41 × 14 =
28. 28.29 × 18 =
29. 29.29 × 14 =
30. 30.48 × 16 =
31. 31.11 × 14 =
32. 32.40 × 24 =
33. 33.14 × 15 =
34. 34.23 × 15 =
35. 35.32 × 18 =
36. 36.12 × 18 =
37. 37.35 × 24 =
38. 38.18 × 12 =
39. 39.34 × 18 =
40. 40.32 × 12 =

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