This download helps children understand the flexibility and power of bar models for addition and subtraction.
Set A (Pages 2 – 13) contain bar models that show all 12 possible addition and subtraction problems that could be asked based on a class of 19 girls and 12 boys.
Set B (Pages 14 – 25) contains the same bar models but with no data.
These cards can be printed A4, A5 or A6 for trading.
Ideas for Use:
1) Partner Card Search – each child is given a card and encouraged to move around the room, reasoning with other children about their cards in order to find the person who has the card that matches their own. Children then solve that problem.
2) Here’s the model, what could the question be? – children are given just the Bar Model cards and encouraged to create their own stories or problems that would fit each card.
3) Here’s the model, which problem is it? – children lay out all the model cards and then turn over a problem card. Their challenge is to match the problem to a card. Which cards go to together?
4) That’s a match, what new problem could we create? – once children have matched the cards, encourage them to create a new problem based on the same information. Can they be flexible with the data?