McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 Answer Key Estimate Sums

All the solutions provided in McGraw Hill Math Grade 3 Answer Key PDF Chapter 2 Lesson 5 Estimate Sums will give you a clear idea of the concepts.

McGraw-Hill My Math Grade 3 Answer Key Chapter 2 Lesson 5 Estimate Sums

Math in My World

Example 1
The Board Shop sold 342 snowboards and 637 pairs of boots in the last year. About how many snowboards and pairs of boots did they sell altogether?
Estimate 342 + 637.
Round, and then add.
When estimating, you can round to the nearest ten or hundred.
McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 Answer Key Estimate Sums 1
One Way Hundreds Place
McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 Answer Key Estimate Sums 2
Another Way Tens Place
McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 Answer Key Estimate Sums 3
To the nearest hundred, the Board Shop sold about ____ snowboards and pairs of boots.
To the nearest ten, the Board Shop sold about ____ snowboards and pairs of boots.
You can have more than one good estimate.
Explanation:
342 + 637 = 979
McGraw Hill My Math Grade 3 Chapter 2 img 2
To the nearest hundred, the Board Shop sold about 900 snowboards and pairs of boots.
To the nearest ten, the Board Shop sold about 970 snowboards and pairs of boots.

Example 2
A board game has $4,140 in play money. About how much money would there be if two games were put together?
Estimate $4,140 + $4,140.
Round to the hundreds place.
McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 Answer Key Estimate Sums 4
McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 Answer Key Estimate Sums 5
So, the two games have about ____ in play money.
At times you may not be told to which place to round a number. You can round to the greatest place.
Explanation:
$4,140 + $4,140 = 8280
McGraw Hill My Math Grade 3 Chapter 2 img 2
So, the two games have about 8,200 in play money.

Example 3
On Tuesday, the White House had 219 visitors. The following day, there were 694 visitors. About how many people visited the White House over the two days?
Estimate 219 + 694.
The greatest place of each number is the ____ place. Round to this place.
McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 Answer Key Estimate Sums 6
So, about ____ people visited the White House over the two days.
Explanation:
McGraw Hill My Math Grade 3 Chapter 2 img 2
219 + 694 = 913
The greatest place of each number is the hundreds place. Round to this place.
So, about 900 people visited the White House over the two days.

Talk Math
Look at the problem in Example 3. How could it be rewritten so an exact answer is needed?
McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 Answer Key Estimate Sums 7
Explanation:
To get an exact answer we need to rounded to tens
By rounding up to tens we get the correct estimation.

Guided Practice

Estimate. Round each addend to the indicated place value.

Question 1.
312 + 27; tens
____ + ____ = _____
Answer:
310 + 30 = 340
312 + 27 = 339
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 2.
383 + 122; hundreds
____ + ____ = _____
Answer:
400 + 100 = 500
383 + 122 = 505
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Independent Practice

Estimate. Round each addend to the indicated place value.

Question 3.
$34 + $23; tens
____ + ____ = _____
Answer:
30 + 20 = 50
$34 + $23 = 57
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 4.
636 + 27; tens
____ + ____ = _____
Answer:
640 + 30 = 670
636 + 27 = 663
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 5.
687 + 231; hundreds
____ + ____ = _____
Answer:
700 + 200 = 900
687 + 231 = 918
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 6.
1,624 + 334; hundreds
____ + ____ = _____
Answer:
1600+ 300 = 1900
1,624 + 334 = 1958
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 7.
1,172 + 1,115; tens
____ + ____ = _____
Answer:
1170 + 1120 = 2290
1,172 + 1,115 = 2,287
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 8.
$4,412 + $1,204; hundreds
____ + ____ = _____
Answer:
4400 + 1200 = 5600
$4,412 + $1,204 = 5616
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Estimate. Round each addend to its greatest place value.

Question 9.
35 + 42
____ + ____ = _____
Answer:
30 + 40 = 70
35 + 42 = 77
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 10.
455 + 229
____ + ____ = _____
Answer:
500 + 200 = 700
455 + 229 = 684
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 11.
272 + 593
____ + ____ = _____
Answer:
300 + 600 = 900
272 + 593 = 865
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 12.
15 + 39
____ + ____ = _____
Answer:
20 + 40 = 60
15 + 39 = 54
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 13.
216 + 536
____ + ____ = _____
Answer:
200 + 500 = 700
216 + 536 = 752
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 14.
44 + 29
____ + ____ = _____
Answer:
40 + 30 = 70
44 + 29 = 73
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Estimate. Round each addend to the nearest ten and nearest hundred.

Question 15.
McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 Answer Key Estimate Sums 8
Answer:
McGraw Hill My Math Grade 3 Chapter 2 img 2
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 16.
McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 Answer Key Estimate Sums 9
Answer:
McGraw Hill My Math Grade 3 Chapter 2 img 2
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 17.
McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 Answer Key Estimate Sums 10
Answer:
McGraw Hill My Math Grade 3 Chapter 2 img 2
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Problem Solving

Question 18.
Mathematical PRACTICE 4 Model Math About how many racers were in the Summer Fun Race? Write a number sentence to solve.
McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 Answer Key Estimate Sums 11
Answer:
130 runners
Explanation:
In summer fun race
There are 79 runners and 51 race walkers
79 + 51 = 130

Question 19.
To the nearest hundred, what would be a reasonable estimate for the total attendance at the county fair for the two days?
McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 Answer Key Estimate Sums 12
Answer:
5900 people
Explanation:
First day = 3621
second day = 2324
3600 + 2300 = 5900
the total attendance at the county fair for the two days

HOT Problems

Question 20.
Mathematical PRACTICE 1 Make Sense of Problems A high school gymnasium can seat 2,136 people. To the nearest ten and hundred, about how many people can sit in the gymnasium? What is the difference between the two estimates?
Answer:
2100 people
Explanation:
A high school gymnasium can seat 2,136 people.
To the nearest ten is 2140
and hundred is 2100
2100 people can sit in the gymnasium.

Question 21.
? Building on the Essential Question When might I need to estimate a sum?
Answer:
The value is near to hundred or near to tens.
we have to identify,
then solving the addition and estimating will be easy.

McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 My Homework Answer Key

Practice

Estimate. Round each addend to the indicated place value.

Question 1.
34 + 65; tens
____ + ____ = _____
Answer:
30 + 70 = 100
34 + 65 = 99
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 2.
583 + 321; hundreds
____ + ____ = _____
Answer:
600 + 300 = 900
583 + 321 = 904
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 3.
591 + 234; hundreds
____ + ____ = _____
Answer:
600 + 200 = 800
591 + 234 = 825
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 4.
$3,327 + $1,548; tens
____ + ____ = _____
Answer:
3330 + 1550 = 4880
$3,327 + $1,548 = 4875
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 5.
2,613 + 3,177; tens
____ + ____ = _____
Answer:
2610 + 3180 = 5790
2,613 + 3,177 = 5790
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 6.
$251 + $207; hundreds
____ + ____ = _____
Answer:
300 + 200 = 500
$251 + $207 = 458
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Question 7.
Estimate. Round each addend to the nearest ten and nearest hundred.
McGraw Hill My Math Grade 3 Chapter 2 Lesson 5 Answer Key Estimate Sums 13
Answer:
Explanation:
hundreds, Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest hundreds and tens

Problem Solving

Question 8.
Three large pizzas cost $36. Two medium pizzas cost $25. To the nearest ten, about how much do all 5 pizzas cost?
Answer:
40 + 20 = 60
Explanation:
Three large pizzas cost $36.
Two medium pizzas cost $25.
36 + 25 = 61

Question 9.
Mathematical PRACTICE 2 Use Number Sense Four hundred ninety-one people attended the school play and 422 people attended the band concert. About how many people attended these two events altogether? Round to the nearest hundred.
Answer:
900 people
Explanation:
491 attended the school play
422 people attended the band concert.
500 + 400 = 900
491 + 422 = 921

Vocabulary Check

Question 10.
Use each word below to explain how you solved Exercise 9.
round       estimate
____________
____________
____________
Answer:
500 + 400 = 900
491 + 422 = 921
Explanation:
491 attended the school play
422 people attended the band concert.
500 + 400 = 900
491 + 422 = 921

Test Practice

Question 11.
Which of the following is the estimated sum of 380 and 437 to the nearest hundred?
A. 700
B. 800
C. 817
D. 820
Answer:
B
Explanation:
380 is rounded to 400
437 is rounded to 400
400 + 400 = 800

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