Addition
6/8 + 2/8
1
What is the mixed number?
The mixed number is combined with one whole number and one fraction
2 x 1/3
1/3 + 1/3 = 2/3
Compare these numbers.
1) 3/2 3/4
2) 2/7 2/3
1) 3/2 = 6/4 > 3/4
2) 2/7 = 6/21 < 2/3 =14/21
Write both fractions with the least common denominator.
3/4 + 5/12
9/12 + 5/12
11/4 - 3/4
8/4 = 2
4 x 5/12 write your answer as an improper fraction and as a mixed number
20/12
Lowest form: 5/3 improper
mixed form: 1 2/3
In the fraction a/b, what does b stand for?
b is the denominator, which stand for the number of equal pieces in one whole.
3/4 + 6/8
3/2
2/3 - 6/9
6/9 - 6/9 = 0/9 = 0
write 5 x 3/4 as a repeated addition sentence
3/4 + 3/4 + 3/4 + 3/4 + 3/4
Can we add or subtract two fractions if the denominators are different?
No.
Finding the common denominator is the first step when you add two unlike fractions.
Adding or subtracting the numerators to get the numerator for your answer.
1/4 + 1/3
1) Write both fractions with common denominators
2) Write the final answer
1) 3/12 + 4/12
2) 7/12
1/2 -1/7
7/14- 2/14 = 5/14
Peter pours 2/9 of a cup pf water into a pot and repeats this six times. How many full cups of water, in total, does he pour into the pot?
2/9 x 6 = 12/9 = 4/3 = 1 1/3
2/3 + 1/2 - 1/4
8/12 + 6/12 -3/12 = 11/12
The recipe for a cheese sauce requires 1/12c. of flour at the beginning and another 1/8c. flour later. How much flour is required?
1/12 + 1/8 = 2/24 + 3/24 = 5/24c.
or
1/12 + 1/8 = 8/96 + 12/96 = 20/96 = 5/24c.
Rosa does 1/2 of her book report on Tuesday and another 20% her book report on Wednesday. What fractions of the book report is left to do?
100% - 1/2 - 20% = 100% -50% - 20%= 30%
30 /100 = 3/10
OR
1 - 1/2 - 1/5 = 10/10 - 5/10 - 2/10 = 3/10
A whole number multiplied by 3/5 is 9. What is the number?
9 = 45/5
a whole number multiplied by 3/5 is 45/5
45/3 =15, the whole number is 15
5x(1/2 + 7/10)
5 x (5/10 +7/10) = 5 x (12/10) = 60 /10 =6
or
5 x (5/10 +7/10) = 5 x (12/10) = 5 x (6/5)=6
or
5 x (5/10 +7/10) = 5 x 5/10 + 5 x 7/10 = 25/10 + 35/10 = 60/10 =6