Estimate Sums & Differences
Estimate to the nearest 0, 1/2, or 1:
1/6?
What is 0?
Estimate the difference:
2 1/8 - 5/7
What is 1?
Find the sum:
7/20 + 2/5?
What is 15/20 or 3/4?
Find the difference:2/3 - 7/12
What is 1/12?
The answer for this, does not have to be in question form.
What is an equivalent fraction?
Give me an example.
Equivalent fractions are, different fractions that hold the same value (must be along the same lines).
1/2 = 2/4
Estimate the difference to the nearest 0, 1/2, or 1:
11/12 - 5/6?
What is 0?
Estimate the sum:
2 2/3 + 7/8 + 6 7/12
What is 11?
1/2 + 9/10
What is 14/10 OR 1 2/5
Use a model to subtract the fractions:
9 5/6 - 4 2/6.
What is 5 3/6 OR 5 1/2
Give me an equivalent fraction for 4/16.
What is:
1/4 , 2/8, 3/12, 20/80...
Estimate the sum to the nearest 0, 1/2, or 1:
5/9 - 1/10?
What is 1?
Find the difference:
9 1/2 - 6 3/4
What is 2 3/4?
Is this equation true?
1 1/2 + 2 5/9 = 3 6/11
If not, what is the real sum?
What is 4 1/18?
Use a diagram to subtract:
4 - 1 1/2
What is 2 1/2?
What is the missing number, represented by x, that makes this statement true?
4/11 = x/110
What is 40?
Estimate:
8/10 + 4/9
What is 1 1/2?
Use a model to find the sum:
2 6/10 + 1 3/5?
What is 4 1/5?
Ms. Custodio will draw the model on the board.
Using a diagram solve this word problem:
Phillip wants to run a total of 3 miles each day. Monday morning, he ran 1 7/8 miles. How many more miles does he still need to run?
What is 1 1/8 miles?
Ms. Custodio will draw the diagram on the board.
Does 1 3/4 make each equation true?
1) 2 1/4 - 6/7 = 1 3/4
2) 2 5.12 - 1 3/4 = 2/3
3) 7 1/12 + 5 3/8 = 1 3/2
4) 1 3/4 + 7/10 = 2 9/20
1) no
2) yes
3) no
4)yes
Find the difference:
6 1/2 - 3 7/10
Explain why you have to find a common denominator to be able to subtract, which number(s) you changed, and explain how you made the equivalent fraction.
What is 2 4/5?
You have to find a a common denominator to subtract because you want all the pieces the same size.
Change 1/2 to 5/10.
5/10 is an equivalent fraction to 1/2, I multiplied 1/2 by 5/5 to get 5/10.
Katya measured the growth of a plant seedling. The seedling grew 1/3 inch by the end of the first week and another 5/6 inch by the end of the second week. About how much did the seedling grow in the first 2 weeks? Explain your estimation.
What is about 1 1/2 inches.
1/3 is closest to 1/2.
5/6 is closest to 1.
Add the difference of 4 5/6 and 1 7/12 to 10 7/20.
Write out the equation
4 5/6 - 1 7/12 + 10 7/20
= 3 1/4 + 10 7/20
= 13 12/20 OR 13 3/5
Rachel has a board that is 1 7/12 feet long and another board that is 2 11/12 feet long. Write an expression Rachel can use to find the total length in feet of the two board.
Solve the equation.
Expression: 1 7/12 + 2 11/12
1 7/12 + 2 11/12 = 4 1/2 ft.
Micah's rain gauge showed that 9 1/2 cm of rain fell last month. This month, the rain gauge measured 10 3/10 cm. How many more cm of rain fell this month?
What is 8/10 or 4/5 cm?
Chose all the equivalent fractions for 2/3:
a) 1/2
b) 13/15
c) 6/9
d) 11/12
e) 26/29
What is c and e?