Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 933 · 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. 1.26 × 15 =
2. 2.19 × 24 =
3. 3.26 × 12 =
4. 4.33 × 12 =
5. 5.45 × 12 =
6. 6.13 × 15 =
7. 7.49 × 14 =
8. 8.49 × 16 =
9. 9.14 × 16 =
10. 10.44 × 18 =
11. 11.12 × 24 =
12. 12.25 × 12 =
13. 13.27 × 18 =
14. 14.20 × 15 =
15. 15.24 × 14 =
16. 16.38 × 14 =
17. 17.26 × 14 =
18. 18.35 × 16 =
19. 19.19 × 16 =
20. 20.36 × 24 =
21. 21.19 × 15 =
22. 22.41 × 15 =
23. 23.12 × 14 =
24. 24.45 × 16 =
25. 25.27 × 12 =
26. 26.12 × 16 =
27. 27.22 × 15 =
28. 28.20 × 12 =
29. 29.39 × 14 =
30. 30.13 × 18 =
31. 31.12 × 12 =
32. 32.18 × 16 =
33. 33.43 × 24 =
34. 34.13 × 12 =
35. 35.28 × 12 =
36. 36.18 × 14 =
37. 37.17 × 18 =
38. 38.32 × 16 =
39. 39.48 × 18 =
40. 40.16 × 14 =

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