This site might be helpful if your child is struggling with the concept of "regrouping" in addition.
VIRTUAL BASE TEN PIECES
http://olc.spsd.sk.ca/de/math1-3/baseten-1.html
Monday, September 20, 2010
Addition
Most students are doing a great job with addition, but some tips for helping your child are included below:
Multi-digit addition can be a challenging concept for some. In order to help students, remind them that they need to -
1) LINE UP DIGITS. Many students are forgetting to line up their digits so that the ones place is directly over the ones place in the addend
368
+219
_____
The 8 and the 9 are directly over each other, helping the child to clearly see what needs to be added together (and to make sure they are adding the correct digits).
2) ADD THE ONES COLUMN FIRST. After adding the ones column, proceed by adding the tens, then the hundreds, etc. Multi-digit addition should always be done RIGHT to LEFT.
3) If, when adding a column together, the sum is larger than 9, students will have to REGROUP. See example below:
278
+159
_____
8+9 is larger than 9, so 17 has to be regrouped as 1 ten and 7 ones. Students should write down the 7 in the ones place and "carry" the one over to the tens. We have practiced using base-ten pieces in class, so students should be able to visualize, or draw out a visual representation of "17" using base ten pieces.
4) ADD ALL DIGITS in a column - even the "carried" digits.
5) CHECK WORK....does it make sense? Often, students will record a sum that is SMALLER than the addends they began with. This is just a careless error and can be easily fixed if students check, or proof their work.
Multi-digit addition can be a challenging concept for some. In order to help students, remind them that they need to -
1) LINE UP DIGITS. Many students are forgetting to line up their digits so that the ones place is directly over the ones place in the addend
368
+219
_____
The 8 and the 9 are directly over each other, helping the child to clearly see what needs to be added together (and to make sure they are adding the correct digits).
2) ADD THE ONES COLUMN FIRST. After adding the ones column, proceed by adding the tens, then the hundreds, etc. Multi-digit addition should always be done RIGHT to LEFT.
3) If, when adding a column together, the sum is larger than 9, students will have to REGROUP. See example below:
278
+159
_____
8+9 is larger than 9, so 17 has to be regrouped as 1 ten and 7 ones. Students should write down the 7 in the ones place and "carry" the one over to the tens. We have practiced using base-ten pieces in class, so students should be able to visualize, or draw out a visual representation of "17" using base ten pieces.
4) ADD ALL DIGITS in a column - even the "carried" digits.
5) CHECK WORK....does it make sense? Often, students will record a sum that is SMALLER than the addends they began with. This is just a careless error and can be easily fixed if students check, or proof their work.
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