I have a 15-year student with significant cognitive delay and short-term memory. I am trying to teach her how to add 3 digit numbers with regrouping and subtracting two digit numbers with regrouping, what can I do?

along with what greyhound girl suggested, I recently just turned looseleaf paper on its side to have the kids line up in columns. I might need large grid paper for some of my kids.

Newspedteach-for me it's a number sense thing (and some of my kids have it as goals for their IEP's-don't ask, stupid system). I think they need to understand regrouping and borrowing to understand basic place value, etc.

It also carries over to multi-digit multiplication in 4th grade.

How long can we just say "hand them a calculator"? This is why we have teenagers manning cash registers unable to hand back correct change on their own; they have no basic number sense.

I teach 3rd grade and my students and I love virtual manipulatives--just google it--choose base ten blocks for addition and base ten blocks for subtraction. It actually moves the blocks as you carry or borrow and shows the number model as well. Hope this helps!

with significant cognitive delay and short-term memory

I'll ask again. How is this an important skill for a student who is likely in a lifeskills program? I'm assuming this, as she does not have even 4th grade math skills at 15.

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How long can we just say "hand them a calculator"?

Do you use a calculator, or add/subtract multi digit numbers by hand? IEP goals must be important and vital for that individual student. This doesn't sound like an important skill to work on at this time, for this student. Of course, I am going by the brief post and have no idea what her evaluation says.

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This is why we have teenagers manning cash registers unable to hand back correct change on their own; they have no basic number sense.

When was the last time you had a cashier count back change? I was just talking about this with my husband and we couldn't think of a time in recent history. The cashier simply scans items and the machines do the work for them. Our grocery store has had power outages and have had to turn people away, as they can't even take money when the power is off. In addition, most people use debit or credit cards.

This student would be much better off being taught how to read and some life skills. To the OP, good luck with your student!

Look into TouchMath. They have good visuals that help students. I haven't had much luck with base ten blocks but I have used popsicle sticks. I bundled zillions of them into groups of tens. Then I use the bundles and indivdual sticks to show various numbers. When it comes to regrouping the students actually take a bundle of sticks, take the rubber band off and it becomes 10 ones instead of 1 ten. ( same thing with addtion. They take 10 ones and bundle them to make 1 ten.) I have found this method to really help them grasp the concept of regrouping since they actually do it themselves. Goodluck.

Well, as it was stated earlier, at 15 a student needs to either learn to use a calculator, or come up with a nemonic
Try BBB (the bumble bee buzzzzzzzz-for the smaller kids)
or BBB Bottom is Bigger you Borrow (oops that's right you aren't suppose to use borrow anymore )
Just remember those of us who teach special education have been there before.
Also, Touch Math is really effective for those who have no number sense
Good Luck