Introduction to Factors Video Lecture | The Complete SAT Course - Class 10

0:0:0: factors for the first time in this short
0:0:4: tutorial you will find out what factors
0:0:7: are and how to find factors using
0:0:10: multiplication factors are whole numbers
0:0:15: that you multiply together to get
0:0:17: another number so in this example two
0:0:21: times five is ten the factors are two
0:0:24: and five you will often be given a
0:0:28: number and told to list all its factors
0:0:32: well you could just think of any numbers
0:0:35: that multiply together to give 12 in
0:0:37: this example but a better plan is to use
0:0:40: the same simple way every time take a
0:0:42: look the first thing you do is find the
0:0:45: simplest way of multiplying to 12 and
0:0:48: you start with 1 so 1 and the number
0:0:52: itself are always the first factors you
0:0:55: list right the factors down in pairs 1
0:0:59: here and 12 over here we will fill in
0:1:3: the space between with other factors as
0:1:5: we go along for each factor pair use an
0:1:9: arc to show which factors multiply
0:1:12: together it helps keep your thinking
0:1:14: clear and stops you from accidentally
0:1:16: forgetting to write a factor down ok now
0:1:19: you try
0:1:20: 2 times number to make 12 well 2 times 6
0:1:24: is 12 list the 2 and the 6 and put the
0:1:28: arc in then 3 times a number 3 times 4
0:1:33: is 12 list the 3 and the 4 put the arc
0:1:37: in 3 & 4 are consecutive numbers so we
0:1:41: know we finish because there's no whole
0:1:44: number between those two we've just
0:1:46: found all the factors of 12 notice that
0:1:50: because we worked from the outside in
0:1:52: the factors are in order this is the
0:1:56: clearest way of showing all the factors
0:1:59: of a number and using the arc for each
0:2:1: factor pair shows you're thinking we'll
0:2:5: do one more example we'll find the
0:2:7: factors of 16 start with one and the
0:2:11: number itself 1 + 16
0:2:13: use the ark now go to to two times
0:2:17: number well 2 times 8 is 16
0:2:19: what about three times a number is three
0:2:22: a factor well 3 times 5 is 15 we can't
0:2:26: get to 16 3 is not a factor of 16 now 4
0:2:31: times a number 4 times 4 is 16 when a
0:2:37: number is multiplied by itself like
0:2:38: before times 4 we just put it in the
0:2:41: factor listing once without any ark and
0:2:43: there are no more factors we found them
0:2:46: all when you're listing all the factors
0:2:50: of a number remember always start with 1
0:2:53: and the number itself with a good space
0:2:56: between then using multiplication try 2
0:2:59: times 3 times 4 times 5 times a number
0:3:2: and up and when your numbers meet in the
0:3:5: middle you have finished always use the
0:3:8: arc to show your thinking and now it's
0:3:10: your turn to practice have fun with this
0:3:13: and become fantastic at factors
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