Class I - Mathematics by Edu-Primes - Dailymotion

Edu-Primes

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Transcript

00:00Hi kids! Today we will learn what is addition and subtraction.

00:09Let's start with addition.

00:15Two balls are drawn here. I draw one more ball.

00:22How many balls are drawn in all now?

00:28Let's count. One, two, three.

00:35So there are three balls now.

00:39That is, by adding one ball to two balls, we get three balls.

00:47Here, this sign means add.

00:54This sign means equal to.

00:58So, two plus one equals three.

01:07There are three apples in the basket.

01:12I put one more apple in the basket.

01:17How many apples are there in all now?

01:24Let's count. One, two, three, four.

01:32So there are four apples in the basket now.

01:36That is, by adding one apple to three apples, we get four apples.

01:44Here, this sign means add.

01:49This sign means equal to.

01:54So, three plus one equals four.

02:01There are six pencils in the stand.

02:05I put one more pencil in the stand.

02:11How many pencils are there in the stand now?

02:16Let's count. One, two, three, four, five, six, seven.

02:31So there are seven pencils in the stand now.

02:36That is, by adding one pencil to six pencils, we get seven pencils.

02:45Good!

02:47Now we will learn what is subtractions.

02:52Let's start with an example.

02:56Two balls are drawn here.

03:00If I erase one ball, how many balls will be left?

03:05Let's count. One.

03:10So only one ball is left.

03:14That is, by subtracting one ball from two balls, we get one ball.

03:22Here, this sign means subtract.

03:29This sign means equal to.

03:33So it says two minus one equals one.

03:40Let's take another example.

03:44There are three apples in the basket.

03:48If I take out one apple from the basket, how many apples are left?

03:56Let's count. One, two.

04:02So two apples are left in the basket.

04:09That is, by subtracting one apple from three apples, we get two apples.

04:18Here, this sign means subtract or minus.

04:25This sign means equal to.

04:29So this mathematical sentence says three minus one equals two.

04:40Good!

04:42Now, let's take another example.

04:47There are six pencils in the stand.

04:52If I take out one pencil from the stand, how many pencils are there in the stand now?

05:01Let's count. One, two, three, four, five.

05:12So there are five pencils in the stand now.

05:17That is, by subtracting one pencil from six pencils, we get five pencils.

05:27Here, this sign means subtract.

05:33And this sign means equal to.

05:39So it says six minus one equals five.

05:46Good!

05:49So what we have learned?

05:52We have learned that when we include more things in a set of things, we say we are adding things.

06:03And this sign means add or plus.

06:09And this sign means equal to.

06:14Like three plus one equals four.

06:21And we count forward to add.

06:26We also learned that when we remove things from a set of things, we say we are subtracting things.

06:39This sign means subtract or minus.

06:44And this sign means equal to.

06:49Like three minus one equals two.

06:57And we count backward to subtract one.

07:01Good!

07:03Now you may go ahead and take a quiz to learn more.

07:07Bye-bye!

Adding And Subtracting 1

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Class I - Mathematics

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