Transcript Estimate

Five-Minute Check (over Lesson 10–5)
Main Idea
Example 1: Estimate Sums
Example 2: Estimate Differences
Example 3: Real-World Example
Example 4: Real-World Example
• I will estimate sums and differences of mixed
numbers.
Estimate Sums
4
1
Estimate 2 6 + 3 6 .
24 + 31
6
6
Estimate 3 + 3 = 6
4
1
Answer: So, 2 6 + 3 6 is about 6.
2
1
Estimate 4 3 + 1 5 .
A. 4
B. 5
C. 6
D. 7
0%
0%
A
B
1.
2.
3.
4.
0%
C
A
B
C
D
0%
D
Estimate Differences
3
7
Estimate 8 8 – 3 8 .
83 – 37
8
8
Estimate 8 – 4 = 4
3
7
Answer: So, 8 8 – 3 8 is about 4.
7
1
Estimate 9 8 – 6 8 .
A. 4
B. 5
C. 6
D. 7
0%
0%
A
B
1.
2.
3.
4.
0%
C
A
B
C
D
0%
D
Javier walked 2 6 miles on Saturday and
10
1 7 miles on Sunday. About how many miles
10
did he walk in all?
Round each mixed number to the nearest whole
number. Then add.
2 6 + 1 7
10
10
Estimate 3 + 2 = 5
Answer: So, Javier walked about 5 miles.
Clairese walked for 1 4 hours on Friday and
5
2 1 hours on Sunday. About how many hours did
5
she walk in all?
A. about 1 hour
B. about 2 hours
C. about 3 hours
D. about 4 hours
0%
0%
A
B
1.
2.
3.
4.
0%
C
A
B
C
D
0%
D
A punch recipe calls for 9 2 cups of juice. Angie
3
has used 6 2 cups of juice in the mixture. About
6
how much more juice does Angie need to finish
making the punch?
2
2
Round 9 3 to 10 and 6 6 to 6.
Estimate 10 – 6 = 4.
Answer: So, about 4 more cups of juice are needed to
finish making the punch.
A recipe calls for 8 1 cups of water. If only
7
4 5 cups has been added in so far, about how
6
much more is needed?
A. about 2 cups
B. about 3 cups
C. about 4 cups
D. about 5 cups
0%
0%
A
B
1.
2.
3.
4.
0%
C
A
B
C
D
0%
D
End of the Lesson
Five-Minute Check (over Lesson 10–5)
Image Bank
Math Tool Chest
Add Like Fractions
(over Lesson 10–5)
Solve. Determine which answer is reasonable.
Ali bought lunch at a restaurant. She spent $5.75
for a sandwich, $1.99 for a cup of soup, and $1.29
for milk. Which is a more reasonable estimate for
the amount of money Ali spent on lunch?
A. $10.00
B. $11.00
1.
2.
3.
4.
C. $9.00
0%
0%
D
0%
C
A
0%
B
D. $8.00
A
B
C
D