Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 123 · 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. 1.14 × 16 =
2. 2.23 × 16 =
3. 3.23 × 18 =
4. 4.32 × 24 =
5. 5.11 × 18 =
6. 6.16 × 16 =
7. 7.27 × 18 =
8. 8.29 × 18 =
9. 9.29 × 12 =
10. 10.38 × 12 =
11. 11.11 × 15 =
12. 12.20 × 24 =
13. 13.11 × 24 =
14. 14.41 × 18 =
15. 15.24 × 14 =
16. 16.15 × 12 =
17. 17.29 × 16 =
18. 18.20 × 14 =
19. 19.27 × 12 =
20. 20.15 × 24 =
21. 21.42 × 16 =
22. 22.27 × 16 =
23. 23.22 × 14 =
24. 24.46 × 24 =
25. 25.20 × 12 =
26. 26.35 × 14 =
27. 27.43 × 16 =
28. 28.26 × 18 =
29. 29.31 × 18 =
30. 30.45 × 18 =
31. 31.26 × 14 =
32. 32.28 × 12 =
33. 33.15 × 14 =
34. 34.40 × 14 =
35. 35.48 × 15 =
36. 36.30 × 14 =
37. 37.36 × 12 =
38. 38.31 × 16 =
39. 39.38 × 16 =
40. 40.48 × 18 =

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