Multiplication Video Lecture | Mathematics for Grade 6

0:0:0: hello
0:0:1: students today we are going to learn
0:0:3: about multiplication which is a very
0:0:6: useful and fun way of doing math do you
0:0:10: know what multiplication is
0:0:13: multiplication is a way of adding the
0:0:15: same number many
0:0:17: times for example if you have three
0:0:20: groups of four apples you can add 4 + 4
0:0:23: + 4 to get 12
0:0:25: apples but there is a faster way to do
0:0:28: this you can multiply 3 by 4 which means
0:0:32: three groups of four you write it like
0:0:36: this 3 * 4 the x is called the
0:0:40: multiplication sign and it tells us to
0:0:42: add the same number as many times as the
0:0:46: other number so 3 * 4 is the same as 4 +
0:0:51: 4 + 4 which is
0:0:53: 12 today we are going to learn about
0:0:56: some important terms related to
0:0:58: multiplication and property of
0:1:1: multiplication now what would you do if
0:1:4: we want to find the total number of
0:1:6: fingers in three
0:1:7: hands we can count the fingers one by
0:1:11: one but this is a very long way of doing
0:1:14: it we can use multiplication to make it
0:1:18: easier and
0:1:19: quicker we can just add 5 + 5 + 5 =
0:1:24: 15 we can write the same thing as 3 * 5
0:1:29: equals
0:1:32: 15 here the number which is to be
0:1:34: repeated or multiplied is called the
0:1:38: multiplicand so here the multiplicand is
0:1:41: five now the number which expresses how
0:1:45: often the multiplicand is repeated is
0:1:47: called the
0:1:49: multiplier so here the multiplier is
0:1:52: three thus multiplier time multiplicate
0:1:56: is equal to
0:1:57: product now look at this example of a
0:2:0: chess board here tell me how many
0:2:4: squares are there in this chess
0:2:6: board well if you count it one by one it
0:2:9: will take a lot of time here's a trick
0:2:13: count the number of rows that is eight
0:2:15: here and then count the number of
0:2:17: squares in one row that is eight here
0:2:21: now just multiply the number of rows and
0:2:24: the number of squares in one row that is
0:2:28: 8 * 8 which equals to
0:2:31: 64 so in this way multiplication is very
0:2:35: useful to quickly count the number of
0:2:38: squares now let's learn about some facts
0:2:41: or properties of
0:2:44: multiplication there are five main
0:2:46: properties of multiplication which are
0:2:48: as
0:2:49: follows first is the order property to
0:2:53: numbers can be multiplied in any order
0:2:57: the product Remains the Same for example
0:3:1: 2 * 3 =
0:3:4: 6 now if we change the order it
0:3:8: becomes 3 * 2 which is again
0:3:13: 6 let's look at another
0:3:16: example what is 7 *
0:3:19: 5 yes it's
0:3:22: 35 now what is 5 *
0:3:25: 7 yes it is also
0:3:28: 35 so both Expressions give the same
0:3:32: answer
0:3:33: 35 the second one is a grouping
0:3:36: property the product of three or more
0:3:39: numbers Remains the Same even if we
0:3:41: change the grouping of
0:3:43: numbers for
0:3:45: example 2 * 3 * 4 here 2 * 3 =
0:3:52: 6 and then 6 * 4 =
0:3:56: 24 now if we group three and 4 4 and
0:4:0: multiply it with 2 it becomes 2 * 3 *
0:4:5: 4 that is 3 * 4 =
0:4:9: 12 and 2 * 12 that is
0:4:13: 24 as you can see both Expressions give
0:4:17: the same answer
0:4:19: 24 now let's look at another
0:4:22: example can you tell me what is 4 * 5 *
0:4:27: 6 correct it is
0:4:32: 120 now tell me what is a value of 4 * 5
0:4:36: *
0:4:38: 6 yes it is
0:4:41: 120 so both Expressions give the same
0:4:45: answer
0:4:47: 120 the third one is multiplication by
0:4:50: one if we multiply a number by one the
0:4:54: product is a number
0:4:56: itself for
0:4:58: example find 5 * 1 = 5 or 9 * 1 = 9 as
0:5:6: you can see the number Remains the Same
0:5:9: easy right the fourth one is
0:5:12: multiplication by zero if we multiply a
0:5:16: number by 0 the product is 0o for
0:5:21: example 6 * 0 = 0 or
0:5:27: 99,999 * 0 = = 0 so 0 is like an eraser
0:5:33: multiply anything with 0 and it becomes
0:5:37: zero now the fifth and the last property
0:5:40: is distributive property of
0:5:42: multiplication over
0:5:44: addition this property tells us how to
0:5:47: multiply a number by a sum or a
0:5:50: difference for
0:5:51: example 2 * 3 + 4 here we can open the
0:5:57: bracket by multiplying to with three and
0:6:0: 4 that is 2 * 3 + 2 * 4 which is 6 +
0:6:7: 8 and that equals to
0:6:10: 14 try solving this one 3 * 5 + 2
0:6:17: correct the answer is
0:6:19: 21 let's see how when opening the
0:6:23: bracket it becomes 3 * 5 + 3 *
0:6:28: 2 that is 15 +
0:6:31: 6 which equals to
0:6:34: 21 with this we have come to the end of
0:6:37: the video I hope you enjoyed learning
0:6:41: about multiplication
0:6:44: facts we hope that you have understood
0:6:46: the concept of
0:6:48: multiplication now here's a secret on
0:6:51: how you can study effectively with the
0:6:53: urv app you can learn with chapter notes
0:6:57: watch video lectures and solve ncer
0:7:1: based McQ tests of this chapter on
0:7:4: urv and that's not all you also get
0:7:7: amazing courses for class 4 and much
0:7:10: more for your class 4
0:7:12: preparation thank you