Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 781 · 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. 1.19 × 16 =
2. 2.25 × 15 =
3. 3.17 × 24 =
4. 4.17 × 14 =
5. 5.42 × 24 =
6. 6.31 × 16 =
7. 7.11 × 18 =
8. 8.34 × 24 =
9. 9.24 × 12 =
10. 10.37 × 14 =
11. 11.38 × 18 =
12. 12.34 × 14 =
13. 13.18 × 16 =
14. 14.24 × 18 =
15. 15.32 × 12 =
16. 16.45 × 12 =
17. 17.39 × 12 =
18. 18.36 × 18 =
19. 19.18 × 15 =
20. 20.41 × 15 =
21. 21.26 × 12 =
22. 22.37 × 15 =
23. 23.28 × 12 =
24. 24.43 × 18 =
25. 25.26 × 16 =
26. 26.38 × 12 =
27. 27.25 × 14 =
28. 28.15 × 18 =
29. 29.30 × 16 =
30. 30.43 × 14 =
31. 31.17 × 15 =
32. 32.18 × 18 =
33. 33.13 × 16 =
34. 34.38 × 16 =
35. 35.49 × 12 =
36. 36.49 × 24 =
37. 37.19 × 18 =
38. 38.42 × 18 =
39. 39.20 × 12 =
40. 40.13 × 15 =

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