Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 363 · 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. 1.22 × 14 =
2. 2.17 × 14 =
3. 3.45 × 14 =
4. 4.16 × 18 =
5. 5.22 × 15 =
6. 6.14 × 18 =
7. 7.21 × 18 =
8. 8.27 × 24 =
9. 9.20 × 24 =
10. 10.37 × 16 =
11. 11.20 × 14 =
12. 12.23 × 12 =
13. 13.46 × 18 =
14. 14.40 × 14 =
15. 15.41 × 16 =
16. 16.34 × 15 =
17. 17.16 × 14 =
18. 18.22 × 24 =
19. 19.30 × 18 =
20. 20.39 × 14 =
21. 21.22 × 18 =
22. 22.24 × 15 =
23. 23.20 × 15 =
24. 24.31 × 15 =
25. 25.38 × 14 =
26. 26.25 × 18 =
27. 27.18 × 14 =
28. 28.13 × 12 =
29. 29.44 × 12 =
30. 30.48 × 24 =
31. 31.39 × 18 =
32. 32.46 × 24 =
33. 33.45 × 18 =
34. 34.45 × 24 =
35. 35.12 × 12 =
36. 36.29 × 18 =
37. 37.12 × 16 =
38. 38.18 × 15 =
39. 39.16 × 12 =
40. 40.48 × 16 =

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