Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 926 · 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. 2.40 × 18 =
3. 3.16 × 18 =
4. 4.14 × 18 =
5. 5.34 × 12 =
6. 6.12 × 18 =
7. 7.33 × 18 =
8. 8.29 × 16 =
9. 9.27 × 14 =
10. 10.21 × 24 =
11. 11.45 × 24 =
12. 12.13 × 15 =
13. 13.28 × 12 =
14. 14.48 × 14 =
15. 15.47 × 18 =
16. 16.45 × 16 =
17. 17.26 × 18 =
18. 18.31 × 12 =
19. 19.30 × 15 =
20. 20.24 × 15 =
21. 21.47 × 16 =
22. 22.38 × 15 =
23. 23.18 × 12 =
24. 24.27 × 15 =
25. 25.48 × 12 =
26. 26.21 × 12 =
27. 27.24 × 16 =
28. 28.16 × 24 =
29. 29.11 × 12 =
30. 30.21 × 16 =
31. 31.17 × 16 =
32. 32.12 × 14 =
33. 33.28 × 18 =
34. 34.14 × 16 =
35. 35.11 × 16 =
36. 36.47 × 15 =
37. 37.47 × 12 =
38. 38.47 × 14 =
39. 39.18 × 16 =
40. 40.28 × 15 =

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