Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 139 · 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 × 18 =
2. 2.41 × 18 =
3. 3.12 × 24 =
4. 4.38 × 16 =
5. 5.28 × 16 =
6. 6.42 × 24 =
7. 7.34 × 14 =
8. 8.12 × 12 =
9. 9.11 × 12 =
10. 10.46 × 18 =
11. 11.13 × 16 =
12. 12.27 × 14 =
13. 13.14 × 14 =
14. 14.28 × 15 =
15. 15.32 × 12 =
16. 16.19 × 14 =
17. 17.41 × 16 =
18. 18.48 × 12 =
19. 19.35 × 24 =
20. 20.36 × 24 =
21. 21.40 × 14 =
22. 22.44 × 14 =
23. 23.12 × 16 =
24. 24.39 × 14 =
25. 25.30 × 18 =
26. 26.36 × 18 =
27. 27.33 × 18 =
28. 28.44 × 12 =
29. 29.30 × 15 =
30. 30.20 × 16 =
31. 31.42 × 16 =
32. 32.28 × 14 =
33. 33.24 × 14 =
34. 34.45 × 14 =
35. 35.25 × 24 =
36. 36.20 × 12 =
37. 37.21 × 14 =
38. 38.13 × 14 =
39. 39.45 × 16 =
40. 40.29 × 15 =

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