Dana Dutch
Math 115
Week 3
Checkpoint Adding and Subtraction Fraction
Section 3.1
22.
or
40.
42. You collect 7 nickels, 4 nickels, and then 5 nickels. How much
money do you have as a fraction of a dollar?
Each dollar is equivalent to 20 nickels (ie. $1 = 20 nickels)
So (7+4+5) / 20 nickels * $1 = 16/20 = 4/5 of a dollar
54.
Section 3.2
47.
Complete the following crossword puzzle.
ACROSS
2.
The LCM of 11 and 13

143
4.
The GCF of 120 and 300
60
7.
The GCF of 13 and 52
13
8.
The GCF of 360 and 540
180
DOWN
1.
The LCM of 8, 14, and 21
168
3.
The LCM of 16 and 12
48
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The LCM of 2, 5, and 13
130
6.
The GCF of 54 and 90
18
Section 3.3
46.
To find the answer you have to
find the GCF of the two fractions. The GCF is 48. So it
looks more like this
24*2=48, 13*2=26,16*3=48, 5*3=15; then I have to get the least
common factor for the next pair which is we know that 11/48 is in their lowest term so now
I had to find what 8 goes into 48 and that is 6. So I did 8*6=48 and 3*6=18 so now its
11/48+18/48=29/48 so the answer is
48.
so the answer is
to get the answer you find the GCF which is 10 so 9/10 stays the same and
5*2=10
and 2*1=2 so now the problem looks like 9/102/10=7/10 now you do to the addition
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 Spring '10
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 Fractions, Fraction, Elementary arithmetic, Greatest common divisor, Mathematics in medieval Islam, Lowest common denominator

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