Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 32 · 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 × 14 =
2. 2.29 × 18 =
3. 3.14 × 24 =
4. 4.11 × 15 =
5. 5.33 × 14 =
6. 6.46 × 16 =
7. 7.48 × 16 =
8. 8.35 × 14 =
9. 9.21 × 14 =
10. 10.16 × 12 =
11. 11.41 × 16 =
12. 12.16 × 24 =
13. 13.14 × 18 =
14. 14.26 × 24 =
15. 15.28 × 14 =
16. 16.24 × 15 =
17. 17.12 × 16 =
18. 18.36 × 24 =
19. 19.22 × 24 =
20. 20.23 × 14 =
21. 21.22 × 18 =
22. 22.20 × 14 =
23. 23.32 × 16 =
24. 24.33 × 12 =
25. 25.25 × 15 =
26. 26.20 × 24 =
27. 27.12 × 12 =
28. 28.34 × 12 =
29. 29.34 × 18 =
30. 30.22 × 16 =
31. 31.21 × 18 =
32. 32.13 × 24 =
33. 33.35 × 24 =
34. 34.44 × 15 =
35. 35.43 × 16 =
36. 36.40 × 14 =
37. 37.15 × 14 =
38. 38.28 × 15 =
39. 39.15 × 16 =
40. 40.27 × 14 =

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