Bài 10: Expanded addition of two digit number

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Starry, you seem to be enjoy yourself.

What are you playing with?

Oh, you are pulling a rubber band and releasing it. It is so interesting.

You are actually expanding a rubber band by stretching it.

Starry, do you know that even numbers can be expanded.

Let me show you how. Look at the two digit number 17.

The digit in the tens place is 1. So its place value is tens.

The digit in the units place is 7. So its place value is 7.

When we add both of place value, we get 10 plus 7.

This is expanded form of 17. So we expanded form 17 is 10 plus 7.

That the place value of all digits of a number written as an addition is the expanded form of the number. It’s that easy!

Let’s take another two digit number. 
68, here 6 is in the tens place.

So its place value is 60 and 8 is in the units place. So its place value is 8.

So the expanded form of  68 is 60 plus 8.

Let’s go for activity.

Write the expanded form of the two digit numbers.

The expanded form of 75 is 70 plus 5.
The expanded form 39 is 30 plus 9.

The expanded form of 88 is 80 plus 8.
 The expanded form of 20 is 20 plus 0.

The expanded form of 64 is 60 plus 4.

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