Page 21 - 新思维数学学生用书2 样章

1 Numbers to 100

Were your estimates good in question 3?
What helps you to make a good estimate?

4 Marcus counts from 0 to 100 in twos.

Draw a ring around any numbers he does not say.

68 7 24 42 37 91 15 86 59 63 8 11 73

Why doesn’t Marcus say these numbers?

Let’s investigate

Zara draws this shape on the 100 square.

She says she always has 2 or 3 odd

numbers in her shape.

Is Zara correct?

Convince your partner that you are

correct.

How did you convince your partner that you were correct?
Did your partner understand your thinking?

Look what I can do!

• I can represent 2-digit numbers in tens and ones.

• I can estimate how many there are then count

to check.

• I can count on and back in ones, twos and tens.

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