Teacher2Teacher

Q&A #764


Checking double digit subtraction

_____________________________________
T2T || FAQ || Ask T2T || Teachers' Lounge || Browse || Search || Thanks || About T2T
_____________________________________


View entire discussion
[<<prev]

From: Judy (for Teacher2Teacher Service)
Date: Nov 26, 1998 at 19:05:07
Subject: Re: Checking double digit subtraction

Annamarie,  

I teach my students that since addition is the opposite of subtraction, they
need to go backwards to check. I have my students circle the answer in
question and the bottom addend. I then tell them that they are are about to
be surprised. They add these two numbers and like "magic" the top addend
reappears. It sounds silly, but they like that touch of magic.

 -Judy, for the Teacher2Teacher service

Post a public discussion message
Ask Teacher2Teacher a new question


[Privacy Policy] [Terms of Use]

_____________________________________
Math Forum Home || The Math Library || Quick Reference || Math Forum Search
_____________________________________

Teacher2Teacher - T2T ®
© 1994-2014 Drexel University. All rights reserved.
http://mathforum.org/
The Math Forum is a research and educational enterprise of the Drexel School of Education.The Math Forum is a research and educational enterprise of the Drexel University School of Education.