Below are some tips that might be
helpful when your student brings home their work on Tuesday. We are focusing on
two different types of addition. They are: Partial-Sums and
Column-Addition.
I have written out an example, and I have also attached a link to a video that will help explain the process as well. It was difficult to format the example for Column-Addition, so I attached a photo. The steps are colored in coordination with the actual work in the photo. If you have questions, let me know! I know this is a very different method, than many of us, including myself, grew up with. We are in this journey together! I have found these methods fantastic for teaching addition, and really help students make sense of addition. Enjoy!
Partial-Sums
The partial-sums method is used to find sums mentally or with paper and pencil. Here is the partial-sums method for adding 2-digit or 3-digit numbers:
Steps:
1.) Add the 100s
2.) Add the 10s
3.) Add the 1s
4.) Then add the sums you just
found (the partial sums).
Example:
46
+37
Add the 10s:
40+30 ----------->
70
Add the 1s:
6+ 7
-----------> +13
Add the partial sums
70+13 -----------> 83
233
+158
Add the 100s:
200+100 -------->
300
Add the 10s:
30+ 50
--------> 80
Add the 1s:
3 + 8
---------> +11
Add the partial sums: 300 +
80 + 11 -----> 391
Column-Addition
The column-addition method can be used to find sums with paper and pencil, but it is not a good method for finding sums mentally.
Here is the column-addition method for adding 2-digit or 3-digit numbers.
1.) Draw lines to separate the 1s, 10s, and 100s places.
2.) Add the numbers in each
column. Write each sum in its column.
3.) If there are 2 digits in the
1s place, trade 10 ones for 1 ten.
4.) If there are 2 digits in the
10s places, trade 10 tens for 1 hundred.
Example:
Add 248+187 using the column-addition method.
Add the numbers in each column
Two digits in the ones place.
Trade 15 ones for 1 ten and 5 ones.
Move the 1 ten to the tens column.
Two digits in the tens place.
Trade 13 tens for 1 hundred and
3 tens
Move the 1 hundred to the
hundreds column
248 + 187 = 435
I hope this information helped. If you every have more questions about our Everyday Math while you are at home, this is a really helpful site to view!This link will take you to the unit we are currently working on.
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