Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 837 · 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. 1.37 × 14 =
2. 2.21 × 14 =
3. 3.12 × 24 =
4. 4.18 × 12 =
5. 5.11 × 18 =
6. 6.46 × 12 =
7. 7.27 × 18 =
8. 8.33 × 12 =
9. 9.21 × 16 =
10. 10.15 × 14 =
11. 11.44 × 14 =
12. 12.17 × 16 =
13. 13.14 × 16 =
14. 14.33 × 16 =
15. 15.26 × 24 =
16. 16.49 × 18 =
17. 17.23 × 16 =
18. 18.18 × 15 =
19. 19.43 × 15 =
20. 20.40 × 15 =
21. 21.38 × 18 =
22. 22.18 × 18 =
23. 23.13 × 14 =
24. 24.44 × 15 =
25. 25.47 × 14 =
26. 26.19 × 18 =
27. 27.11 × 12 =
28. 28.28 × 24 =
29. 29.24 × 15 =
30. 30.28 × 16 =
31. 31.12 × 16 =
32. 32.48 × 18 =
33. 33.15 × 16 =
34. 34.30 × 16 =
35. 35.16 × 15 =
36. 36.45 × 24 =
37. 37.36 × 16 =
38. 38.47 × 12 =
39. 39.21 × 24 =
40. 40.27 × 14 =

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