1. Today:
December 2, 2013
 Warm-Up
 Percent Mental
Math
 Class Work:
Focus on
Fractions

2. Khan Academy Topics
For December 8th

3. Fraction, Decimal,
& Percent Unit

4. Warm-Up:
1. Before working this problem, look at/analyze it, then
describe your plan to solve based on what you see in this
particular problem. Be specific, use complete sentences.
Do not solve here. more than one term, I’m going
Because there is
___________________________________________
to
_____________________________________________
simplify by factoring. If I can cancel factors from
____________________________________________
the
1. -3n2I + 7n
numerator & denominator, will.
n

5. Warm-Up:
2. Same directions for this problem:
________________________________________
This is not a proportion, so I’ll have to multiply
____________________________________________
each term by the LCD to eliminate the denominators.
________________________________________
Then I’ll combine like terms and solve as usual.
3. Which fraction must have more than two decimal places?
Why?? Because six does not go evenly into 100.
A.) ¼
B.) 2/5
C.) 12/50
D.) 5/6
E.) None

6. Warm-Up:
** These fractions represent the three possible ways to
convert fractions to decimals. The denominator:
a.) Is itself one of the place values
b.) Divides evenly into one of the place values: Multiply
top and bottom by that amount
c.) Either does not divide evenly into a place value, or
you are not sure: Divide the numerator by the
denominator

7. Class Notes:
Since converting fractions into decimals and percent can
mean a lot of dividing, it is best to memorize as many
fractional conversions as possible. The more you
memorize, the less math you need to do. Complete &
learn the following chart:

8. Fraction Conversions:
Fraction
Decimal
Percent
0.5
50
0.33
33.3
0.25
25
0.20
20
0.16
16.7
0.1428571
14
0.125
12.5
0.11
11
0.09
9

9. Fraction Conversions:
Mental Math Style
.6
.28
.18
.375
.44

10. Mental Math:
Percent of a Number
A. 10% of $1.00 is .1, or (10 cents). To find 10%, simply move the
decimal one place to the left. B. 20% is what fraction?
.2
To find 20% of any number, multiply by 2 and move the
decimal one place to the left. 20% of 40 is….. 8
1) 10 2) 25
2) 20
Find 5% using mental math 1)
10 2) 20
Find 15% using mental math 1)
Find 20% using mental math 10
1)
2) 3.5
20
3)
42.1
3)
60
3)
60
3) 60
4) 380
4)
160
4)
120
4) 125

11. Class Work: