Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 958 · 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. 1.15 × 16 =
2. 2.39 × 12 =
3. 3.26 × 14 =
4. 4.17 × 12 =
5. 5.41 × 15 =
6. 6.46 × 14 =
7. 7.20 × 15 =
8. 8.19 × 16 =
9. 9.17 × 16 =
10. 10.33 × 24 =
11. 11.12 × 14 =
12. 12.16 × 16 =
13. 13.41 × 18 =
14. 14.25 × 16 =
15. 15.37 × 12 =
16. 16.16 × 14 =
17. 17.35 × 18 =
18. 18.12 × 12 =
19. 19.35 × 14 =
20. 20.16 × 24 =
21. 21.43 × 24 =
22. 22.11 × 12 =
23. 23.20 × 14 =
24. 24.27 × 18 =
25. 25.26 × 24 =
26. 26.25 × 14 =
27. 27.49 × 14 =
28. 28.23 × 16 =
29. 29.18 × 18 =
30. 30.44 × 16 =
31. 31.36 × 12 =
32. 32.32 × 18 =
33. 33.42 × 14 =
34. 34.30 × 24 =
35. 35.45 × 15 =
36. 36.46 × 16 =
37. 37.37 × 14 =
38. 38.21 × 15 =
39. 39.40 × 14 =
40. 40.34 × 16 =

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