Which One Doesn't Belong?
The potential learning intentions:
Focuses attention on attributes of number and number relationships
Engages students in problem solving
Encourages using Mathematical vocabulary
Show the image and let the students discuss.
What do you notice?
What makes all the items alike?
What makes them different?
Which one doesn’t belong?
Can you share your reasoning to justify your answer?
Twitter Hashtag: #wodb https://twitter.com/search?q=%23wodb&src=typd
Christopher Danielson has written a "Which One Doesn't Belong" book focused on Shapes that has an excellent teacher's guide.