Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 578 · 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 × 18 =
2. 2.37 × 14 =
3. 3.26 × 15 =
4. 4.16 × 18 =
5. 5.11 × 24 =
6. 6.16 × 16 =
7. 7.48 × 12 =
8. 8.35 × 16 =
9. 9.29 × 14 =
10. 10.14 × 18 =
11. 11.26 × 12 =
12. 12.11 × 15 =
13. 13.38 × 18 =
14. 14.40 × 12 =
15. 15.35 × 12 =
16. 16.31 × 16 =
17. 17.45 × 18 =
18. 18.23 × 16 =
19. 19.43 × 12 =
20. 20.34 × 24 =
21. 21.28 × 16 =
22. 22.15 × 12 =
23. 23.30 × 18 =
24. 24.16 × 15 =
25. 25.44 × 24 =
26. 26.41 × 12 =
27. 27.38 × 15 =
28. 28.33 × 12 =
29. 29.43 × 15 =
30. 30.15 × 14 =
31. 31.26 × 18 =
32. 32.19 × 12 =
33. 33.32 × 12 =
34. 34.36 × 16 =
35. 35.33 × 14 =
36. 36.47 × 16 =
37. 37.20 × 16 =
38. 38.27 × 12 =
39. 39.24 × 18 =
40. 40.26 × 14 =

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