Adding Fractions
Subtracting Fractions
Adding Mixed Numbers
Subtracting Mixed Number
Estimatiing and LCM
100
5/11 + 4/11
9/11
100
11/15 - 6/15=
5/15 simplify divide by 5= 1/3
100
2 3/4 + 4 1/4=
6 4/4= simplified = 7
100
10 3/4 - 8 1/4=
2 2/4 simplify divide by 2= 2 1/2
100
Find the LCD of 9, 12, 24.
9= 9, 18, 27, 36, 45, 54, 63, 72, 81 12: 12, 24, 36, 48, 60, 72 24: 24, 48, 72, 96,120 LCD: 72
200
6/7 + 1/2
LCD=14, 12/14 + 7/14= 19/14 simplified= 1 5/14
200
5/6 - 1/6=
4/6 simplify divide by 2= 2/3
200
5 1/8 + 6 3/8=
11 4/8 simplify divide by 4= 11 1/2
200
3 20/21 - 2 6/21=
1 14/21 simplify divide by 7= 1 2/3
200
What is the LCD of 1/3 and 3/5?
3: 3, 6, 9, 12, 15, 20 5: 5, 10, 15, 20, 25 LCD: 15
300
3/8 + 1/4
LCD=8, 3/8 + 2/8 = 5/8
300
3/4 - 1/4=
2/4 simplified = 1/2
300
4 1/3 + 6 4/5=
LCD: 15= 4 5/15 + 6 12/15= 8 17/15= 11 2/15
300
A standard bowling lane is 41 1/2 inches wide. The width of a bowling lane and one gutter is 50 13/16 inches. What is the width of the gutter?
LCD: 16: 50 13/16 - 41 8/16= 9 5/16inches
300
What is the least common denominator used to add 7/10 + 7/12?
10: 10, 20, 30, 40, 50, 60, 70 12: 12, 24, 36, 48, 60 LCD: 60
400
2/3 + 2/3
4/3 simplified 1 1/3
400
5/8 - 1/4=
LCD: 8= 5/8 - 2/8= 3/8
400
5 5/12 + 2 1/6=
LCD: 12= 5 5/12 + 2 2/12= 7 7/12
400
5 1/8 - 2 3/4=
LCD: 8= 5 1/8 - 2 6/8= 41/8 - 22/8= 19/8 simplify= 2 3/8
400
What is 5 15/32 rounded to the nearest whole number? (estimate)
5, half of 32 is 16. Therefore the numerator is larger than the denominator so you leave the number the same
500
3/4 + 3/4
6/4 simplified = 1 2/4 = 1 1/2
500
8/9 - 2/3=
LCD: 27= 24/27 - 18/27= 6/27 simplify divide by 3= 2/9
500
9 3/5 + 4 7/15=
LCD: 15 = 9 9/15 + 4 7/15= 13 16/15= 14 1/15
500
20 1/4 - 19 1/2=
LCD: 4= 20 1/4 - 19 2/4= 81/4 - 78/4 = 3/4
500
Estimate 6 1/2 - 4 2/3=
7 - 5= 2
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