The document references a series of mathematical reasoning exercises and problems aimed at identifying which elements do not belong in given sets. It includes various arithmetic expressions and numerical patterns, suggesting multiple correct answers may exist for each problem. The format emphasizes engaging learners in critical thinking and problem-solving skills through math.

1. #WODB
Maths Week
Use reasoning and problem solving to decide
Which One Doesn’t Belong.
There could be more than 1 correct answer!

2. #WODB
3 + 3
seven 7

3. #WODB

4. #WODB
5 6
7 9

5. #WODB
5 + 2 = 2 + 5 3 + 9 = 9 + 3
6 + 2 = 2 + 7 4 + 7 = 7 + 4

6. #WODB
6
+6
six

7. #WODB
9
5 + 5

8. #WODB
First

9. #WODB

10. #WODB
7 + 3
3
+7

11. #WODB
one two
three five

12. #WODB
4
+7

13. #WODB

14. #WODB
1 9 1a

15. #WODB