Estimating with Fractions
3 2/3 + 5 1/6
About 9
quotient
divide
5/9 + 2/9
7/9
Like Fractions
Fractions that have the same denominators are called like fractions.
7 4/9 + 10 2/9
17 6/9 or 17 2/3
6 2/5 x 1 7/8
Product about 12
difference
subtract
9/10 - 1/10
8/10 = 4/5
Unlike Fractions
To add or subtract unlike fractions, or fractions with different denominators, rename the fractions using the LCD. Then add or subtract as with like fractions.
8 5/6 - 2 1/3
6 3/6 or 6 2/3
1/8 + 2/3
sum
add
1/2 + 1/6
4/6 = 2/3
Compatible Numbers
Compatible numbers, or numbers that are easy to compute mentally, can also be used to estimate.
2 1/3 - 1 2/3
2/3
6/7 - 7/10
product
multiply
11/12 - 3/8
13/24
Combines a whole number and a fraction
3 1/2 + 2 1/2
6
8/9 divide 5/6
The quotient is about 1
Name the order of the operations
Parenthesis
Exponent
Multiply
Divide
Addition
Subtract
7/10 - 3/5
1/10
What is a fraction
What is a numerator
What is a denominator
Fraction: Is a way to show a part of a whole.
Numerator: top number, how many parts you have
Denominator: bottom number, equal parts the whole is divided into
7 5/8 + 4 6/8
12 3/8