Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 109 · 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. 2.30 × 12 =
3. 3.20 × 18 =
4. 4.28 × 16 =
5. 5.23 × 15 =
6. 6.48 × 18 =
7. 7.32 × 14 =
8. 8.33 × 24 =
9. 9.23 × 14 =
10. 10.15 × 15 =
11. 11.39 × 16 =
12. 12.47 × 16 =
13. 13.41 × 15 =
14. 14.29 × 18 =
15. 15.45 × 18 =
16. 16.16 × 16 =
17. 17.36 × 14 =
18. 18.21 × 24 =
19. 19.37 × 16 =
20. 20.22 × 18 =
21. 21.42 × 14 =
22. 22.11 × 16 =
23. 23.17 × 16 =
24. 24.41 × 14 =
25. 25.17 × 24 =
26. 26.30 × 15 =
27. 27.19 × 18 =
28. 28.32 × 18 =
29. 29.44 × 14 =
30. 30.47 × 15 =
31. 31.33 × 14 =
32. 32.12 × 16 =
33. 33.48 × 16 =
34. 34.38 × 18 =
35. 35.13 × 24 =
36. 36.16 × 12 =
37. 37.26 × 12 =
38. 38.21 × 14 =
39. 39.40 × 12 =
40. 40.13 × 12 =

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