Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 437 · 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. 1.17 × 16 =
2. 2.29 × 14 =
3. 3.19 × 16 =
4. 4.46 × 18 =
5. 5.49 × 14 =
6. 6.28 × 24 =
7. 7.20 × 16 =
8. 8.19 × 12 =
9. 9.11 × 14 =
10. 10.15 × 16 =
11. 11.11 × 18 =
12. 12.40 × 24 =
13. 13.30 × 14 =
14. 14.37 × 14 =
15. 15.43 × 12 =
16. 16.45 × 16 =
17. 17.47 × 24 =
18. 18.19 × 24 =
19. 19.13 × 12 =
20. 20.32 × 14 =
21. 21.33 × 16 =
22. 22.37 × 15 =
23. 23.34 × 14 =
24. 24.13 × 15 =
25. 25.14 × 18 =
26. 26.21 × 24 =
27. 27.48 × 14 =
28. 28.39 × 14 =
29. 29.14 × 15 =
30. 30.37 × 12 =
31. 31.28 × 12 =
32. 32.40 × 12 =
33. 33.32 × 15 =
34. 34.35 × 18 =
35. 35.17 × 18 =
36. 36.41 × 18 =
37. 37.15 × 14 =
38. 38.18 × 24 =
39. 39.36 × 24 =
40. 40.25 × 24 =

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