Transcript Elena and Jordan`s Place Value Powerpoint

Expanded notation,
trading and place value.
By Elena and Jordan
Place value
When you are doing place value you need to
pay attention to the number columns. For
example,
H T
O
1 2
5
Place value is like looking where the
numbers are placed in the columns. If
there is a one in the hundreds column, it
becomes a hundred, a two in the tens
place and it becomes twenty, but numbers
in the ones column stay the same.
Place value can be used for a bigger
number too.
Expanded Notation
Expanded notation is when you stretch a
number out. For example, if you had the
number 125, the expanded version would
be 100+20+5. You can expand numbers
that are higher as well;
1,257=1000+200+50+7.
If you had the number 12,593, there are
two ways to expand it. One way is to do
it like this; 12,000+500+90+3, but you can
expand it more, 12,000 is made up of
10000 and 2000, so the other way is
10000+2000+500+90+3. Those are the
different ways.
Trading step 1
Trading is what happens when you do
addition. When you look in the ones
column of the numbers you are adding
and they equal more than ten you
have to trade. For example,
645
+126
Five plus six is eleven, so that’s is more
than ten. So you have to move the ten
into the tens column, and keep the
remaining one in the ones place.
Trading step 2
Once you have moved the ten the sum
should look like this:
64’5
+126
1
The small line above the 4 represents
the extra ten. Under the ones column
is the answer one. Now look at the
tens column. 40+20=60, but when you
add the extra ten it becomes 70, so
put a seven under the tens column for
an answer.
Trading step 3
Now the sum should look like this:
645
+126
7 1
Now look at the hundreds column.
600+100=700, so put another seven under
the hundreds column for an answer.
645
+126
771
So the total answer is 771!
The end!!!
Everything by Elena and
Jordan!