2. Whiteboardmaths.com © 2004 All rights reserved 5 7 2 1

3. 1 610153 Triangular Number Archery 14 1 10 6 3 1 6 3 1 6 3 1

4. 1 6153 Triangular Number Archery 28 2 6 3 1 6 3 1 6 3 1 10

5. 1 6153 Triangular Number Archery 41 3 6 3 1 6 3 1 6 3 1 10

6. 1 6153 Triangular Number Archery 33 4 6 3 1 6 3 1 6 3 1 10

7. 1 6153 Triangular Number Archery 22 5 6 3 1 6 3 1 6 3 1 10

8. 1 6153 Triangular Number Archery 33 6 6 3 1 6 3 1 6 3 1 10

9. 1 6153 Triangular Number Archery 30 7 6 3 1 6 3 1 6 3 1 10

10. 1 6153 Triangular Number Archery 34 8 6 3 1 6 3 1 6 3 1 10

11. 1 6153 Triangular Number Archery 32 10 6 3 1 6 3 1 6 3 1

12. 1 6153 Triangular Number Archery 35 10 6 3 1 6 3 1 6 3 1

13. 1 6153 Triangular Number Archery 40 11 6 3 1 6 3 1 6 3 1 10

14. 1 6153 Triangular Number Archery 39 12 6 3 1 6 3 1 6 3 1 10

15. 1 6153 Triangular Number Archery 52 13 6 3 1 6 3 1 6 3 1 10

16. 1 6153 Triangular Number Archery 50 14 6 3 1 6 3 1 6 3 1 10

17. 1 6153 Triangular Number Archery 48 15 6 3 1 6 3 1 6 3 1 10

18. 1 6153 Triangular Number Archery 29 16 6 3 1 6 3 1 6 3 1 10

19. 1 6153 Triangular Number Archery 49 17 6 3 1 6 3 1 6 3 1 10

20. 1 6153 Triangular Number Archery 61 18 6 3 1 6 3 1 6 3 1 10

21. 1 6153 Triangular Number Archery 47 19 6 3 1 6 3 1 6 3 1 10

22. Triangular Number Archery 75 20 1 6153 6 3 1 6 3 1 6 3 1 10

23. 21 3645 55 28 Triangular Number Archery 105 21 45 36 28 21 45 36 28 21 45 36 28 21

24. 3645 55 28 Triangular Number Archery 140 22 45 36 28 21 45 36 28 21 45 36 28 21

25. 3645 55 28 Triangular Number Archery 180 23 45 36 28 21 45 36 28 21 45 36 28 21

26. 3645 55 28 Triangular Number Archery 197 24 45 36 28 21 45 36 28 21 45 36 28 21

27. 3645 55 28 Triangular Number Archery 134 25 45 36 28 21 45 36 28 21 45 36 28 21

28. 3645 55 28 Triangular Number Archery 185 26 45 36 28 21 45 36 28 21 45 36 28 21

29. 3645 55 28 Triangular Number Archery 153 27 45 36 28 21 45 36 28 21 45 36 28 21

30. 3645 55 28 Triangular Number Archery 225 28 45 36 28 21 45 36 28 21 45 36 28 21

31. 3645 55 28 Triangular Number Archery 174 29 45 36 28 21 45 36 28 21 45 36 28 21

32. 3645 55 28 Triangular Number Archery 185 30 45 36 28 21 45 36 28 21 45 36 28 21

33. 3645 55 28 Triangular Number Archery 235 31 45 36 28 21 45 36 28 21 45 36 28 21

34. 3645 55 28 Triangular Number Archery 275 32 45 36 28 21 45 36 28 21 45 36 28 21

35. 3645 55 28 Triangular Number Archery Tricky one! Ask your teacher 33 45 36 28 21 45 36 28 21 45 36 28 21

36. 1 2 3 4 5 6 7 8 9 10 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50   Worksheet