Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 840 · 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. 1.35 × 12 =
2. 2.26 × 14 =
3. 3.13 × 15 =
4. 4.42 × 18 =
5. 5.32 × 12 =
6. 6.36 × 16 =
7. 7.25 × 16 =
8. 8.46 × 18 =
9. 9.12 × 14 =
10. 10.13 × 24 =
11. 11.36 × 12 =
12. 12.45 × 15 =
13. 13.44 × 14 =
14. 14.29 × 14 =
15. 15.27 × 18 =
16. 16.35 × 15 =
17. 17.30 × 16 =
18. 18.34 × 24 =
19. 19.35 × 24 =
20. 20.46 × 15 =
21. 21.48 × 12 =
22. 22.37 × 12 =
23. 23.45 × 24 =
24. 24.24 × 14 =
25. 25.30 × 24 =
26. 26.40 × 18 =
27. 27.11 × 18 =
28. 28.15 × 12 =
29. 29.42 × 16 =
30. 30.22 × 24 =
31. 31.16 × 24 =
32. 32.49 × 18 =
33. 33.21 × 12 =
34. 34.46 × 14 =
35. 35.12 × 18 =
36. 36.20 × 14 =
37. 37.22 × 12 =
38. 38.34 × 14 =
39. 39.28 × 16 =
40. 40.42 × 14 =

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