Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 794 · 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. 1.18 × 16 =
2. 2.49 × 18 =
3. 3.43 × 18 =
4. 4.33 × 24 =
5. 5.43 × 14 =
6. 6.43 × 24 =
7. 7.21 × 18 =
8. 8.29 × 16 =
9. 9.23 × 24 =
10. 10.34 × 16 =
11. 11.21 × 15 =
12. 12.32 × 15 =
13. 13.41 × 24 =
14. 14.27 × 15 =
15. 15.43 × 15 =
16. 16.12 × 14 =
17. 17.35 × 14 =
18. 18.17 × 16 =
19. 19.11 × 18 =
20. 20.37 × 14 =
21. 21.44 × 12 =
22. 22.16 × 14 =
23. 23.12 × 18 =
24. 24.22 × 14 =
25. 25.19 × 24 =
26. 26.27 × 24 =
27. 27.22 × 12 =
28. 28.15 × 14 =
29. 29.37 × 15 =
30. 30.48 × 24 =
31. 31.21 × 14 =
32. 32.19 × 18 =
33. 33.32 × 12 =
34. 34.39 × 14 =
35. 35.49 × 12 =
36. 36.42 × 18 =
37. 37.36 × 24 =
38. 38.47 × 14 =
39. 39.23 × 16 =
40. 40.16 × 24 =

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