
NUMBERS GREATER THAN 1000
DAY 7
Compact Representations and Equivalence
Key Mathematical Ideas
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Represent numbers greater than 1000 in a compact way using the Linear Abacus®.
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Write equivalent descriptions when modelling numbers naturally on the abacus strings and in compact models. Connect physical models with arithmetic descriptions.
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Understand different but equivalent representations of large numbers.
Exploration
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Model the number 2375 using your Linear Abacus® and explain your journey to this bead to someone else. Present this both linearly and as a compact representation.
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Share their creative thinking on our Mathematics Community Forum
Support
If children are counting by 1's be sure to encourage them to use the colour on the beads to work more efficiently. ​It's important that they recognise rows of colour as10 and full abacus strings and 100.
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Extension
Find another journey to this bead and show how both models and arithmetic descriptions are equivalent?​
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Micro Writing Task
Complete day 7 of your journal. For parents and teachers this prompt encourages children to begin organising their thinking and making interpretations. Encourage them to use clear examples and elaborations to ensure they understand how to represent numbers and use the Linear Abacus® as a model- this includes how they manipulate the abacus string as communicate their ideas.