Numicon® shapes are weighted and so are the perfect resource for exploring equivalences. Make sure that learners have had the opportunity to play with the scales and the shapes before doing the challenge.
How are you going to record what you have found?
Use the shapes and an equals sign (download here) as a record. Ask children to explain what they have done. Ask:
Are all the pairs different?
How do you know that your pair of shapes are equal to 10?
2. Use a pan balance working board (download here) to record the shapes on.
3. Select a written number sentence (download here) that matches their shapes.
Digit Dog is looking for two Numicon® shapes that are equal to the 10 shape. Calculating Cat is challenging him to find another two shapes, and then another two, and then another two.
Find one example, then another, then another, then one your friend hasn’t foundis a good strategy to encourage learners to use their reasoning skills. Once they have found one pair of shapes challenge them to find another pair, ask:
Is this pair different?
How will you know when you have found all the pairs?
How are you going to record your work?
Look at the pairs that your friend has found. Are they the same? Different?
Are there any shapes you haven’t used? Why?
Encourage learners to check their pairs by putting them on the 10 shape.
Can you put your pairs of shapes in order?
Why can’t you use the 5 shape?
You choose three shapes to total 10? How many ways can you do it?