Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 657 · 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. 1.18 × 16 =
2. 2.18 × 12 =
3. 3.13 × 16 =
4. 4.45 × 15 =
5. 5.20 × 16 =
6. 6.21 × 14 =
7. 7.33 × 24 =
8. 8.25 × 12 =
9. 9.16 × 16 =
10. 10.43 × 16 =
11. 11.30 × 12 =
12. 12.23 × 15 =
13. 13.12 × 14 =
14. 14.11 × 16 =
15. 15.32 × 18 =
16. 16.38 × 16 =
17. 17.38 × 12 =
18. 18.20 × 24 =
19. 19.47 × 12 =
20. 20.19 × 12 =
21. 21.41 × 18 =
22. 22.21 × 12 =
23. 23.36 × 18 =
24. 24.28 × 14 =
25. 25.17 × 16 =
26. 26.41 × 12 =
27. 27.48 × 24 =
28. 28.46 × 12 =
29. 29.35 × 18 =
30. 30.31 × 18 =
31. 31.44 × 15 =
32. 32.40 × 14 =
33. 33.44 × 18 =
34. 34.27 × 15 =
35. 35.24 × 24 =
36. 36.12 × 15 =
37. 37.34 × 16 =
38. 38.45 × 18 =
39. 39.28 × 12 =
40. 40.23 × 24 =

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