Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 919 · 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. 1.44 × 16 =
2. 2.22 × 12 =
3. 3.42 × 16 =
4. 4.40 × 24 =
5. 5.24 × 16 =
6. 6.14 × 16 =
7. 7.16 × 12 =
8. 8.42 × 15 =
9. 9.34 × 15 =
10. 10.18 × 14 =
11. 11.31 × 12 =
12. 12.44 × 14 =
13. 13.49 × 12 =
14. 14.34 × 16 =
15. 15.30 × 24 =
16. 16.19 × 14 =
17. 17.22 × 18 =
18. 18.32 × 12 =
19. 19.31 × 24 =
20. 20.28 × 12 =
21. 21.21 × 16 =
22. 22.18 × 15 =
23. 23.46 × 15 =
24. 24.26 × 12 =
25. 25.28 × 18 =
26. 26.12 × 15 =
27. 27.27 × 18 =
28. 28.24 × 12 =
29. 29.32 × 14 =
30. 30.49 × 24 =
31. 31.30 × 12 =
32. 32.23 × 12 =
33. 33.42 × 24 =
34. 34.16 × 16 =
35. 35.21 × 14 =
36. 36.22 × 16 =
37. 37.23 × 15 =
38. 38.45 × 18 =
39. 39.39 × 16 =
40. 40.13 × 16 =

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