Today is just a quick post to share what we did today in math. Our school is using the Go Math series and it is Common Core aligned. This is the third year using it and I finally feel like I have grasp on some of the alternative methods they use to teach students addition and subtraction.
Today we were working on triple digit subtraction with zeros.
This is the standard method that the series shows and how we all learned
growing up. This way however is so confusing for many of my students!
They always make the same mistake.
Here's an example.
They know if they don't have enough ones to borrow a ten.
They don't have any tens so they borrow a hundred.
They regroup in the tens place,
but they always forget to take from the ten BEFORE
they add a ten to the ones place!
So I changed it up today and decided to show them
a way that might make more sense.
We reviewed that 400 is the same as 40 tens.
So we took away one ten and gave it to the ones.
They caught on so quick and made very few mistakes!!
Even my strugglers were very successful with this method.
I hope it really sticks with them and makes subtracting
zeros a much easier process.
Do you teach this method or other ways besides the standard algorithm? I know Common Core is pushing others to find new strategies. I hope you can add this one to your list.