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GenX-Education
  • 9/24/2024
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!