I have noticed that due to some reasons our students need lots of help with 2-3 digits subtraction and addition borrowing and regrouping. Please help your child to strengthen the second grade skills. Thank you so much.
It does not matter what way they do, they need to know the concept and able to show the work on the math worksheet. That is all that matters.
https://www.khanacademy.org/math/arithmetic/arith-review-add-subtract/arith-review-regrouping-3-dig/v/basic-regrouping-or-borrowing-when-subtracting-three-digit-numbers
https://www.khanacademy.org/math/arithmetic/arith-review-add-subtract/arith-review-add-within-100a/v/addition-with-regrouping
worksheets you can find on:
http://www.worksheetfun.com/2013/03/25/3-digit-addition-regrouping-carrying-6-worksheets/
http://www.worksheetfun.com/2013/03/25/3-digit-borrow-subtraction-regrouping-5-worksheets/