All the solutions provided in McGraw Hill My Math Grade 3 Answer Key PDF Chapter 2 Review will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 3 Chapter 2 Review Answer Key
Vocabulary Check
Choose the correct word(s) below to complete each sentence.
Associative Property bar diagram Commutative Property
estimate Identity Property mental math
parentheses pattern reasonable
regroup unknown
Question 1.
The _____ of Addition states that you can change the order of the addends and still get the same sum.
Answer:
Commutative property
Explanation :
Commutative property of Addition states that you can change the order of the addends and still get the same sum.
Question 2.
_____ tell you which operations to group in a number sentence.
Answer:
parentheses
Explanation :
parentheses tell you which operations to group in a number sentence
Question 3.
_____ is a way of doing math in my head.
Answer:
mental math
Explanation:
Mental math is a way of doing math in my head.
Question 4.
A number close to its actual value is a(n) _____
Answer:
estimate
Explanation:
A number close to its actual value is an estimate
Question 5.
To use place value to exchange equal amounts when renaming a number is to ____
Answer:
regroup
Explanation:
To use place value to exchange equal amounts when renaming a number is to regroup
Question 6.
A ____ is a set of numbers that follow a certain order.
Answer:
pattern
Explanation:
A set of numbers that follow a certain order is a pattern
Question 7.
The ____ of Addition states when you add zero to any number, the sum is that number.
Answer:
Identity
Explanation:
The Identity Property of Addition states that the sum of any number and zero is that number.
Concept Check
Question 8.
When an answer makes sense, it is ____
Answer:
reasonable
Explanation:
When an answer makes sense, it is reasonable
Question 9.
The missing number or what you are solving for in a problem is the ____
Answer:
unknown
Explanation:
The missing number or what you are solving for in a problem is the unknown
Concept Check
Find each sum. Identify the property of addition. Write Commutative, Associative, or Identity.
Question 10.
8 + 0 = ____
_________
Answer:
Identity (8+0=8)
Explanation:
The Identity Property of Addition states that the sum of any number and zero is that number.
Question 11.
2 + (4 + 3) = ___
(2 + 4) + 3 = ____
Answer:
Associative
2 + (4 + 3) = 9
(2 + 4) + 3 = 9
Explanation:
The Associative Property of Addition states that the way addends are grouped does not change the sum.
Question 12.
5 + 7 = ____
7 + 5 = ____
Answer:
5 + 7 =12
7 + 5 =12
Explanation :
Commutative property of Addition states that you can change the order of the addends and still get the same sum.
Write the number.
Question 13.
1 more than 375
_________
Answer:
1 more than 375 is 376
Explanation:
1 + 375 = 376
Question 14.
1.000 more than 2,184
_________
Answer:
1.000 more than 2184 is 2185
Explanation:
1.000 + 2184 = 2185
Make a ten or a hundred to add mentally.
Question 15.
____ + ____ = _____
Answer:
200 + 130 = 330
Explanation:
Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest tens
Question 16.
____ + ____ = _____
Answer:
1273 + 3600 = 4873
Explanation:
Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest tens
Estimate. Round each addend to the indicated place value.
Question 17.
725 + 229; tens
____ + ____ = _____
Answer:
725 + 229 = 954
720 + 234 = 954
Explanation:
Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest tens
Question 18.
8,291 + 1,101; hundreds
____ + ____ = _____
Answer:
8291 + 1101 = 9392
8290 + 1102 = 9392
Explanation:
Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest tens
Add. Check for reasonableness.
Question 19.
Estimate:
____ + ____ = _____
Answer:
Explanation:
640 + 280 = 920
Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest tens
Question 20.
Estimate
____ + ____ = _____
Answer:
Explanation:
2200 + 5090 = 7290
Tens and ones are taken apart and added separately
By expanded form we can add the numbers by rounding them to nearest tens
Problem Solving
Write a number sentence with a symbol for the unknown. Then solve.
Question 21.
A horse weighs 1,723 pounds. A smaller horse weighs 902 pounds. How much do both horses weigh together?
Answer:
both horses weigh together 2625 pounds.
Explanation :
A horse weighs 1,723 pounds
A smaller horse weighs 902 pounds
1723 + 902 = 2625
sum of 1723 and 902 is 2625
Question 22.
A golf ball has 336 dimples. How many dimples would two golf balls have altogether?
Answer:
two golf balls will have 672
Explanation :
A golf ball has 336 dimples so two golf balls will have 672
336 + 336 = 672
sum of 336 and 336 is 672
Question 23.
Samuel walked one mile before lunch and one mile after lunch. The length of a mile is 1,760 yards. In yards, what is the total distance Samuel walked?
Answer:
total distance Samuel walked is 3520 yards
Explanation :
The length of a mile is 1,760 yards.
Samuel walked two miles in total.
sum of 1760 + 1760 = 3520
Question 24.
There are two different mountains in the state of Washington that get record snowfall. One winter season, Mount Ranier received 1,224 inches of snow. Mount Baker received 1,140 inches of snow. What is the total snowfall of these two mountains?
Answer:
total snowfall of these two mountains is 2364
Explanation :
Mount Ranier received 1,224 inches of snow.
Mount Baker received 1,140 inches of snow.
1224 + 1140 = 2364
so the total snowfall of these two mountains is 2364
Test Practice
Question 25.
Dwight drove 792 miles from Pensacola, Florida, to Key West, Florida, and then back again. What is the distance he traveled to the nearest hundred miles?
A. 800 miles
B. 1,580 miles
C. 1,584 miles
D. 1,600 miles
Answer:
A
Explanation :
the nearest hundred miles of 792 is 800
Reflect
Use what you learned about addition to complete the graphic organizer.
Now reflect on the ESSENTIAL QUESTION? Write your answer below.