Page 20 - 新思维数学学生用书2 样章

1.2 Counting up to 100 objects

Let’s investigate

What if Zara chose zero ones?

What can you say about those numbers?

What if Arun chose zero tens?

What can you say about those numbers?

Discuss your answers with a partner.

3 How many in each collection? Estimate then count to check.

Estimate

10 20 50 100

Count

Tip

Draw a ring around groups

of 10 objects. Count in tens

and then in ones to find out

how many in the collection.

Estimate

10 20 50 100

Count

Tip

You could choose to count

in twos as well as tens.

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