Count a large group of objects by counting tens and ones
I can count larger groups of objects efficiently using tens and ones to help me.
Count a large group of objects by counting tens and ones
I can count larger groups of objects efficiently using tens and ones to help me.
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Lesson details
Key learning points
- One item can be used to represent several other items. This is called unitising.
- The order in which tens and ones are arranged does not affect the value of the number.
- We can use a one hundred square to help find the value of two-digit numbers more efficiently.
Keywords
Unitising - Unitising means treating groups that contain, or represent, the same number of things as ‘ones’ or ‘units’. It is important in understanding place value and supports us to think multiplicatively.
Common misconception
Children may continue counting in tens when they reach the ones, e.g. count 2 tens and 3 ones completely in tens. They may think arrangement of tens and ones affects how to count them.
Make deliberate errors to prompt discussion and refer back to previous stem sentences, e.g. 'The objects are in ones, so I can count them in ones.' Present tens and ones in non-standard arrangements, so children practise always counting tens first.
To help you plan your year 2 maths lesson on: Count a large group of objects by counting tens and ones, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 2 maths lesson on: Count a large group of objects by counting tens and ones, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 1 maths lessons from the Counting and representing the numbers 20 to 99 unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
Licence
Lesson video
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Starter quiz
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Exit quiz
6 Questions
