Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 33 · 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. 1.12 × 12 =
2. 2.11 × 12 =
3. 3.32 × 12 =
4. 4.42 × 18 =
5. 5.29 × 14 =
6. 6.23 × 12 =
7. 7.29 × 24 =
8. 8.26 × 18 =
9. 9.15 × 18 =
10. 10.14 × 12 =
11. 11.12 × 14 =
12. 12.20 × 24 =
13. 13.32 × 24 =
14. 14.35 × 18 =
15. 15.20 × 15 =
16. 16.37 × 24 =
17. 17.29 × 12 =
18. 18.30 × 16 =
19. 19.23 × 16 =
20. 20.45 × 14 =
21. 21.24 × 14 =
22. 22.44 × 14 =
23. 23.34 × 18 =
24. 24.30 × 18 =
25. 25.32 × 16 =
26. 26.41 × 18 =
27. 27.42 × 16 =
28. 28.19 × 12 =
29. 29.11 × 18 =
30. 30.24 × 12 =
31. 31.36 × 12 =
32. 32.33 × 12 =
33. 33.25 × 16 =
34. 34.32 × 14 =
35. 35.29 × 18 =
36. 36.46 × 16 =
37. 37.21 × 14 =
38. 38.40 × 14 =
39. 39.45 × 12 =
40. 40.48 × 14 =

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