Estimating
1/2
Find the common denominator of:
1/6 and 1/9
54, 36, or other possible answers
Write an equation for the word problem below:
From a board 8 feet in length, Tommy cut two 2 1/3 foot bookshelves. How much of the board remains?
8= 2 1/3 + 2 1/3 + X
Use the Associative property for 1/3 + (1/3 + 1/6)
(1/3 + 1/3) + 1/6
1/2, 2/3, 5/6, what is the pattern?
Add 1/6
What is a reasonable estimate for 9/10?
1
Find the common denominator for 3/8 and 3/10.
40
Solve this word problem:
From a board 8 feet in length, Tommy cut two 2 1/3 foot bookshelves. How much of the board remains?
3 1/3 feet
Use the commutative property for (1/5 + 3/10) + 2/5
(3/10 + 1/5) + 2/5
Start with 7/8, subtract 2/16
12/16
What is a reasonable estimate for the equation 5/8 - 1/5?
1/2 - 0
Find the common denominator and equivalent fractions for: 1/9 and 5/12
4/36, 15/36
Write and equation and solve the following word problem:
Marcie bought a 50-foot roll of packing tape. She used two 8 5/6 foot lengths. How much tape is left on the roll.
50= 8 5/6 + 8 5/6 + X
32 1/3 feet
Use the associative property for (3/10 + 1/5) + 2/5
3/10 + (1/5 + 2/5)
What fraction comes next in this number sequence: 1/9, 1/3, 5/9 ?
7/9
What is a reasonable estimate for the below equation? Please solve the equation with this estimate.
11/12 + 6/10= 1 + 1/2 = 1 1/2
Find the least common denominator and equivalent fractions for: 2/5 and 1/10
4/10 1/10
Write an equation and solve the word problem below:
Paula spent 3/8 of her allowance on clothes and 1/6 on entertainment. What fraction of her allowance did she spend on other items?
1= 3/8 + 1/6 + X
11/24
Use the associative and commutative property to solve the following equation:
5/12 + (5/12 + 3/4)
(5/12 + 5/12) + 3/4 = 1 7/12
Identify the rule and the next number in the following sequence:
3/10, 2/5, x
Rule add 1/10
5/10 or 1/2
Why do we estimate fractions before adding them?
To help us determine whether our answer is reasonable.
Find the least common denominator and equivalent fractions for: 1/3, 2/7
7/21, 6/21
Write an equation then solve the following word problem:
Caitlin has 4 3/4 pounds of clay. She uses 1 1/10 to make a cup and another 2 pounds to make a jar. How many pounds are left?
4 3/4= 1 1/10 + 2 + X
X= 1 13/20
Use the associative and commutative property for the following equation:
(1/5 + 1/2) + 2/5
(2/5 + 1/5) + 1/2= 1 1/10
Identify the rule and the next number in the following sequence:
1/3, 1/2, 3/4
Rule: add 1/4
4/4 or 1