Composition of decade numbers to 100: making groups of 10 | Maths

Starter quiz

How many groups of bricks can you see?

2

3 ✓

8
Which of these shows 1 group of 10?
Complete the stem sentence. This is not 1 group of 10 because __________

it has 10 objects.

it does not have 10 objects. ✓
How many groups of 10 can you see?

3

2

1 ✓
Match the groups of tens to the number of tens they represent.

3 groups of 10

⇔

3 tens ✓

10 group of 10

⇔

10 tens ✓

8 groups of 10

⇔

8 tens ✓

1 group of 10

⇔

1 ten ✓
Which picture represents 4 tens?

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Objects can be put into groups of 10 to make them easier to count.
You can recognise a group of 10 because when you separate them, there will be 10 objects.
If there is not 10 in each group, they are not groups of 10.
Groups of 10 can be called tens.

Any group of objects can be counted in tens.

Identify groups that do and do not have 10 objects, drawing attention to the fact that colour, orientation and size are not relevant.

Group - Objects that are gathered together into a set are said to be in a group.
Separate - When a group of objects are taken or split apart they have been separated.