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.

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

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)