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Bài 15: Subtracing using number – line

(Phép trừ với số trên đường kẻ)

 

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Bài 15: Subtracing using number – line

Starry, I notice you like play with your number beads.

Starry, I notice you like play with your number beads.

And you have learnt to use them to make the number line .Good!

And you have learnt to use them to make the number line .Good!

And I told you the number line is useful to us in many ways.

And I told you the number line is useful to us in many ways.

Today I will show you how you can do the subtraction with the number line.

Today I will show you how you can do the subtraction with the number line.

You do remember how to draw the number line Starry?

You do remember how to draw the number line Starry?

Yes, 2 arrows on each the side with numbers 0-1-2-3-4-5-6-7-8-9 and 10 written at equals distances.

Yes, 2 arrows on each the side with numbers 0-1-2-3-4-5-6-7-8-9 and 10 written at equals distances.

Let us take 5 minus 2.

Let us take 5 minus 2.

Look at the number line and start from 5, do subtract 2, we move 2 places to the left.

Look at the number line and start from 5, do subtract 2, we move 2 places to the left.

1-2, we reach the number 3. So 5 minus 2 is 3.

1-2, we reach the number 3. So 5 minus 2 is 3.

You look happy Starry, that’s easy, isn’t it?

You look happy Starry, that’s easy, isn’t it?

What about 6 minus 4?

What about 6 minus 4?

Start from 6, we move 4 places to the left 1-2-3-4, we reach the number 2.

Start from 6, we move 4 places to the left 1-2-3-4, we reach the number 2.

So 6 minus 4 is 2.

So 6 minus 4 is 2.

Here is 4 minus 1. Start from 4, we move 1 place to the left we reach the number 3. So 4 minus 1 is 3.

Here is 4 minus 1. Start from 4, we move 1 place to the left we reach the number 3. So 4 minus 1 is 3.

Let’s us now do an activity together!

Let’s us now do an activity together!

We have to first subtract by crossing out the objects and next carry out the subtraction using the number line.

We have to first subtract by crossing out the objects and next carry out the subtraction using the number line.

Shall we begin!

Shall we begin!

First we have the kites.1-2-3-4-5-6-7-8 kites minus 1-2-3 kites that 8 minus 3 that is 1-2-3-4-5 kites.

First we have the kites.1-2-3-4-5-6-7-8 kites minus 1-2-3 kites that 8 minus 3 that is 1-2-3-4-5 kites.

Now using the number line, start at 8 move 3 places to the left 1-2-3 we reach the number 5.

Now using the number line, start at 8 move 3 places to the left 1-2-3 we reach the number 5.

So 8 minus 3 equals 5.

So 8 minus 3 equals 5.

Next the balls 1-2-3-4-5-6-7 balls minus 1-2-3-4-5 balls that 7 minus 5 equals 1-2 balls.

Next the balls 1-2-3-4-5-6-7 balls minus 1-2-3-4-5 balls that 7 minus 5 equals 1-2 balls.

Now using the number line, start at 7 move to 5 places to the left 1-2-3-4-5 we reach the number 2.

Now using the number line, start at 7 move to 5 places to the left 1-2-3-4-5 we reach the number 2.

So 7 minus 5 equals 2.

So 7 minus 5 equals 2.

Now, look at the tops1-2-3-4-5 tops minus 1 top that 5 minus 1 equals 1-2-3-4 tops.

Now, look at the tops1-2-3-4-5 tops minus 1 top that 5 minus 1 equals 1-2-3-4 tops.

Now using the number line, start at 5 move 1 place to the left, we reach number 4.

Now using the number line, start at 5 move 1 place to the left, we reach number 4.

So 5 minus 1 equals 4.

So 5 minus 1 equals 4.

And now the marble Starry! 1-2-3-4 marbles minus 1-2-3 marbles that 4 minus 3 equals 1 marble.

And now the marble Starry! 1-2-3-4 marbles minus 1-2-3 marbles that 4 minus 3 equals 1 marble.

Now using the number line, start at 4 move 3 places to the left 1-2-3 we reach the number 1.

Now using the number line, start at 4 move 3 places to the left 1-2-3 we reach the number 1.

So 4 minus 3 equals 1.

So 4 minus 3 equals 1.

So Starry the number line is useful for both addition and subtraction.

So Starry the number line is useful for both addition and subtraction.