Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 557 · 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. 2.22 × 16 =
3. 3.19 × 18 =
4. 4.46 × 16 =
5. 5.46 × 18 =
6. 6.35 × 14 =
7. 7.34 × 18 =
8. 8.46 × 12 =
9. 9.39 × 18 =
10. 10.29 × 14 =
11. 11.31 × 14 =
12. 12.32 × 18 =
13. 13.23 × 24 =
14. 14.40 × 24 =
15. 15.20 × 24 =
16. 16.14 × 14 =
17. 17.30 × 15 =
18. 18.31 × 15 =
19. 19.24 × 24 =
20. 20.41 × 16 =
21. 21.34 × 15 =
22. 22.46 × 15 =
23. 23.23 × 16 =
24. 24.30 × 16 =
25. 25.36 × 16 =
26. 26.15 × 15 =
27. 27.24 × 15 =
28. 28.11 × 14 =
29. 29.45 × 15 =
30. 30.38 × 15 =
31. 31.25 × 24 =
32. 32.26 × 16 =
33. 33.39 × 14 =
34. 34.26 × 24 =
35. 35.11 × 18 =
36. 36.41 × 24 =
37. 37.38 × 16 =
38. 38.44 × 12 =
39. 39.25 × 15 =
40. 40.27 × 14 =

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