hey there it's Kalei this lesson is on fact families in using a multiplication
chart as a tool this is a multiplication chart the numbers that go down tell us
how the row is growing by twos like 2 4 6 8 10 and so on and the numbers across
the top tell us how the columns are growing like by tens 10 20 30 40 and so
on we use it like this say I need to calculate 3 times 6 I can find 3 on the
side and 6 on the top where those two lines intersect is the answer 3 times 6
is 18 I can also use my multiplication chart to divide let's say I have 35
divided by 7 well first I find my divisor on the side 7 and then I go
across until I find 35 right here and now I go straight up whatever number is
at the top is my answer 5 so 35 divided by 7 is 5 now let's
focus on our twos it will be helpful if you know how to skip count or count by
twos like 2 4 6 8 10 12 14 16 18 20 22 24 now let's use our multiplication
chart to learn about fact families I need to find 2 times 3 so the first
thing I do is find 2 over on the side here and then I just highlight
across then I find three up on the top and I highlight down and where those two
lines intersect is my answer six now what if I needed to find three times
two well the first thing I'm going to do is
find three over here on the side and I'm gonna highlight across then I'm going to
find two up here at the top and I'm going to highlight down and where those
two pink lines intersect is my answer which is also six so this tells me that
two times three and three times two are a fact family a fact family is when all
the numbers are the same in different math facts now what if I needed to find
six divided by two well I'm gonna take my divisor here too I'm gonna find it
over here on the side of my chart and then I highlight over until I find my
dividend which is six from six I go straight up and whatever number is up at
the top is my answer three so notice that these numbers in this equation are
also six two and three so I can add this to my fact family that was two times
three equals six and three times two equals six now what do you think will
happen if I have six divided by three first I take my divisor here I find it
over on the side of my chart I'm gonna highlight over until I find my dividend
right there is six and then I go straight up and I have my answer right
there at the top two and how lucky are we this equation also has the numbers 6
3 & 2 so it looks like this equation can also join into our fact family
here so all four of these equations are a fact family 4 2 3 & 6 if you can learn
one math fact you can figure out all four facts in the family let's look at
the example of 4 times 5 equals 20 since I know this fact I know that I can
switch around my factors so 5 times 4 is also 20 and in my fact family since the
three numbers are all the same now if I know the multiplication facts I can
deduct the division facts I can take the product of my multiplication and divide
it by one of my factors to get the other like 20 divided by 4 is 5 and if that is
true then I know I can say 20 divided by 5 is 4 and now I have an entire fact
family so let's do a trickier one together I'm gonna find the fact family
with the numbers that include 9 and 6 so let's figure out what 9 times 6 days use
your multiplication chart remember I come over here and I find 9 on the side
and then I highlight all the way across then I find 6 up on the top and I
highlight all the way down and where my pink lines intersect is my answer which
is right there 54 so since I know that this already is a math fact I can switch
around my factor so I know 6 times 9 is also equal to 54 and since these three
numbers are all the same I know that's a fact family now let's do a division
problem what if I needed to know 54 divided by whoops 54 divided by 9 so
remember what I can do is I take my divided
here I find it over here on the side I
highlight across until I find the number 54 and then I go straight up and I get
my answer which is 6 which knowing that these numbers form a fact family 9 6 and
54 we could have deducted that summons we can also say 54 divided by 6 is equal
to 9 nice so now we found another fact family and now you get to try use your
multiplication table to find the fact families 4 1 through 12 practice what
you've learned by playing our online games and quizzes have fun and remember
to always be clever