Math A.Tube.com
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What are “mental mathematics?
The new math curriculum expects a
student to be able to do lots of math in his
head, or
use “mental mathematics”.  As adults, we
do a lot of math in our heads! Most people
estimate in their heads at the grocery
store, fast food restaurants or department
stores.
Very few of us take out a pencil and paper
to solve problems we might have. We are
able to
do this because of many years of practice
doing mental math in real life situations.
In your child‛s classroom, students will be
encouraged to find ways to use mental
math
when solving problems. For example, a
teacher might pose the following problem:
I had some coins in my pocket that made 39¢. Fourteen cents fell out. How much
money do I have left in my pocket?
Students will be encouraged to find a way to solve it in their head that makes sense to
them!
Here are 3 possible strategies that students might use:
I know that 39¢ take away
4¢ is 35¢. 35¢ take away
10¢ is 25¢.
I know that 39¢ can be made
up with a quarter, a dime,
and four pennies. A dime and
four pennies is 14¢. So, 39¢
minus 14¢ is a quarter or 25¢.
I know that 39¢ is close to
40¢. 40¢ take away 10¢ is
30¢. Take away 4¢ more and
that‛s 26¢. Now take off the
1¢ that made 40¢.
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