Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 944 · 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. 1.28 × 16 =
2. 2.11 × 14 =
3. 3.22 × 15 =
4. 4.49 × 12 =
5. 5.22 × 12 =
6. 6.30 × 12 =
7. 7.29 × 14 =
8. 8.31 × 24 =
9. 9.33 × 18 =
10. 10.19 × 18 =
11. 11.18 × 18 =
12. 12.15 × 15 =
13. 13.11 × 16 =
14. 14.20 × 12 =
15. 15.38 × 18 =
16. 16.38 × 12 =
17. 17.26 × 12 =
18. 18.24 × 24 =
19. 19.15 × 16 =
20. 20.27 × 16 =
21. 21.25 × 24 =
22. 22.31 × 16 =
23. 23.32 × 24 =
24. 24.44 × 24 =
25. 25.14 × 15 =
26. 26.11 × 15 =
27. 27.34 × 18 =
28. 28.12 × 18 =
29. 29.34 × 24 =
30. 30.45 × 12 =
31. 31.46 × 15 =
32. 32.19 × 12 =
33. 33.26 × 14 =
34. 34.35 × 12 =
35. 35.15 × 12 =
36. 36.29 × 18 =
37. 37.16 × 24 =
38. 38.47 × 24 =
39. 39.48 × 12 =
40. 40.33 × 16 =

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