1. L 8: Mental Math: Subtracting
At the end of this lesson you will be able to:
Improve mental ability to solve a math problem
Identify information needed for the situation, including distinguishing between relevant and irrelevant information.

2. Would be easier to do these problems mentally or use pencil and paper?
4.23 – 1.86
(pencil)
7.45 – 3.34
(mental)
8.14 – 6.01
6.02 – 1.8
4.27 – 1.13
5.06 – 1.05

3. How would you break up the following numbers to subtract mentally?
80 – 36
(80 – 30 – 6)
90 – 28
(90 – 20 – 8)
165 – 86
(165 – 80 – 6)