Q&A #1521

Teachers' Lounge Discussion: Subtraction

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From: Owen

To: Teacher2Teacher Public Discussion
Date: 2006071821:26:08
Subject: Subtraction

You can find information on how to help children undersand subtraction on the DotMath for kids web site at: http://dotmath.tripod.com/ This week, I taught a 7 year-old girl (first grader) the Dotmath system. We spent about an hour on it. During the lesson she wanted to check her answers with the regular calculator but it went dead. The solar panel was of no help. She learned why she should depend on herself and not on a calculator that can fail. Later she had a race against her father. He had a regular calculator and she had a paper Dotmath calculator (no batteries). She was asked combinations of addition and subtraction up to the number 9. She got every answer correct and was able to give the answer before her father could type the question into the regular calculator. If this system is taught correctly the children can beat the regular calculator. Owen

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