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00:00Hey kids, and thank you for joining me, the Ping Pong Champion here.
00:07Do you guys want to play against me?
00:10Great!
00:11Hold up your hands like you are moving a paddle, and here we go!
00:19Ouch!
00:21You guys are pretty good, but the ball has to stay on the table.
00:24I am glad you are here because I could really use your help.
00:28My friend and I had these ping pong balls in an array like you see here,
00:32but then he turned them sideways like this.
00:35Now I know this is still an array, but the amount has to be different
00:38because we just changed the order.
00:40My friend said that they are the same, and I did not believe him,
00:43and all he said was,
00:44Commutative property, dude!
00:47So today we are learning about the commutative property of multiplication.
00:51This is like a rule in math.
00:54Can you say this with me?
00:56Commutative property of multiplication.
00:59Great job!
01:00Now here is the definition.
01:03Commutative property of multiplication says the order of the numbers does not matter.
01:10To learn this, let's look at an equation.
01:14Here we have an equation that says 3 times 5 equals 5 times 3.
01:18Let's do the math and figure it out.
01:213 times 5 is what?
01:2415, great job!
01:27Now on to the other side.
01:29What is 5 times 3?
01:3215, great job again!
01:34It seems strange at first because the order of the numbers is changed,
01:38but when you multiply it, it comes out to be the same.
01:41Pretty cool stuff!
01:43I want to try one more that my friend showed me with an array.
01:48Here is the equation and let's do the multiplication starting on the left side.
01:524 multiplied by 2 is what?
01:558, great!
01:57Now on to the other side.
01:59What is 2 multiplied by 4?
02:02It is also 8.
02:04So the order of the numbers does not matter in multiplication.
02:07This is awesome and to finish I want to show you the array of balls my friend showed me.
02:13Here we have 4 times 2 in an array which gives us 8 balls total.
02:18Now if we switch the numbers around it turns our array to look like this.
02:24This is 2 times 4.
02:27Even though the array looks different there are still 8 balls.
02:30This is amazing!
02:32Because of the commutative property in multiplication,
02:35it does not matter which number is first because the product or answer will be the same.
02:40Amazing! Thank you so much for your help!
02:45Guys, why are you all aiming ping pong balls at me?
02:48Take it easy! Take it easy!
02:50Oh no!
02:53Ow!