hello my name is Kylie and welcome to subtracting two-digit regrouping where
you will learn how to tackle subtracting bigger numbers with the technique called
regrouping ready to master subtracting bigger numbers let's go
first let's refresh your memory about place value I know I know you know this
already but trust me it's important when we get to harder subtraction so let's
take a look at number 46 do you remember which is the tens and which is the ones
correct the six is in the ones place and the 4 is in the tens place the four
really is worth 40 because it is in the tens place standing for four tens or
tens equals 40 be sure to watch our videos on place
value to go into more detail great now that we have your brain in the right
place value mode let's continue okay take a look at the problem here notice
it is written neatly with the place values lined up just like an addition
this is very important in two digit subtraction graph paper can be really
useful and helping you keep the numbers lined up notice the six ones from 46 is
lined up perfectly with the three ones in 23 the same can be seen with the tens
place the four tens or 40 is lined up with the two tens or twenty we subtract
from right moving left or from the smallest place value the ones to the
largest place value in this case it is the tens let's subtract the ones place
in our problem six ones minus three ones is three ones while the three under the
subtraction line and remember to keep it lined up with the ones place moving on
to the tens place subtract four tens minus two tens which equals two tens
write the two under the subtraction line and remember to keep it lined up with
the ones place the end result is two tens and three ones or 23 how about you
try one on your own try 68 minus 57 pause the video and see
if you get the correct answer did you get 11 great seems pretty simple but
what happens when you run into this situation when you go to life line up
the ones and tens you may notice there are two ones and thirty two and nine
ones and 19 there are not enough ones in 32
so to subtract the nine ones and 19 should you panic and run away no of
course not remember when I said we need to review place value your knowledge
we'll save the day and make this subtraction problem a snap since 32
doesn't have enough ones in the one place we can borrow or regroup we are
going to group the place value in the number 32 in a different way take a look
at the problem again we can take some of the tens from the tens place on the
number 32 the three is really three tens or thirty remember it has plenty of ones
we can use so let's borrow in chunks of 10 since
it's in the tens place cross the three out and write a two on top of it that
way we know we have regrouped and borrowed one set of ten or ten ones now
where do we put those 10 months where we need them with the two in the ones place
if we add ten ones with two ones we get twelve ones cross out the two and write
twelve above it now we can subtract because we've regrouped enough ones in
order to subtract the nine twelve ones minus nine ones is three ones we write
the answer three under the subtraction line in the ones place when we go to the
left to tackle the tens place we still have enough tends to tends to subtract
the one ten from the 19 two tens minus 110 is 110 we write the one under the
subtraction line how about you try one on your own
try 44 minus 29 pause the video and see if you get the correct answer
did you get 15 great you've got it now you can subtract two-digit numbers even
if the ones place doesn't have enough ones to do so and you didn't even run
away keep practicing our online games and quizzes watch more videos and
remember to always be clever