All the solutions provided in McGraw Hill My Math Grade 2 Answer Key PDF Chapter 2 Review will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 2 Chapter 2 Review Answer Key
Vocabulary Check
array equal groups even
odd repeated addition skip count
Complete each sentence.
Question 1.
__________________ have the same number of objects.
Answer:
equal groups
Explanation:
equal groups have the same number of objects.
Question 2.
You can ____ by counting objects in equal groups of two or more.
Answer:
repeated addition
Explanation:
You can repeated addition by counting objects in equal groups of two or more.
Question 3.
An ______________ numberof objects has 1 leftover when counted by 2s.
Answer:
Odd
Explanation:
An odd number of objects has 1 leftover when counted by 2s.
Question 4.
An ____ is a group of objects arranged in rows and columns of the some length.
Answer:
Array
Explanation:
An Array is a group of objects arranged in rows and columns of the some length.
Concept Check
Write the missing numbers.
Question 5.
65, ____,75, 80, ___, 90, ____, 100
Answer:
65, 70,75, 80, 85, 90, 95, 100
Explanation:
The above given pattern is skip by 5
In skip count by five we keep adding five to get to the next number.
65 + 5 = 70
70 + 5 = 75
Question 6.
30, ____, 50, 60, ____, 80, ____
Answer:
30, 40, 50, 60, 70, 80, 90
Explanation:
The above given pattern is skip by 10
In skip by 10 we add 10 to get the next number
Fill in the blanks to describe each array.
Question 7.
____ rows of ____
Answer:
3 rows of 4
Explanation:
In the above array grid
3 rows of 4 are colored
3 x 4 = 12 so, 12 blocks are colored
Question 8.
____ rows of ____
Answer:
5 rows of 5
Explanation:
In the above array grid
5 rows of 5 are colored
5 x 5 = 25
so, 25 blocks are colored.
Circle even or odd.
Question 9.
Answer:
Explanation:
A whole number that is able to be divided by two into two equal whole numbers is an even number
8 can be divided in to two equal halves
Question 10.
Answer:
Explanation:
The whole numbers that cannot be divided exactly into pairs
13 cannot be divided in to equal parts
Question 11.
Answer:
Explanation:
A whole number that is able to be divided by two into two equal whole numbers is an even number
10 can be divided in to two equal halves
Write the equal addends that make each sum.
Question 12.
8 = ____ + ____
Answer:
8 = 4 + 4
Explanation:
The sum of equal addends of 8 are 4 and 4
4 + 4 = 8
Question 13.
16 = ____ + ____
Answer:
16 = 8 + 8
Explanation:
The sum of equal addends of 16 are 8 and 8
8 + 8 = 16
Question 14.
12 = ____ + ____
Answer:
12 = 6 + 6
Explanation:
The sum of equal addends of 12 are 6 and 6
6 + 6 = 8
Question 15.
18 = ____ + ____
Answer:
18 = 9 + 9
Explanation:
The sum of equal addends of 18 are 9 and 9
9 + 9 = 18
Find the missing addends.
Question 16.
7 + ____ = 14
Answer:
7 + 7 = 14
Explanation:
The sum of equal addends of 14 are 7 and 7
Question 17.
___ + 9 = 18
Answer:
9 + 9 = 18
Explanation:
The sum of equal addends of 18 are 9 and 9
Question 18.
____ + 6 = 12
Answer:
6 + 6 = 12
Explanation:
The sum of equal addends of 12 are 6 and 6
Question 19.
3 + ____ = 6
Answer:
3 + 3 = 6
Explanation:
The sum of equal addends of 6 are 3 and 3
Question 20.
____ + 5 = 10
Answer:
5 + 5 = 10
Explanation:
The sum of equal addends of 10 are 5 and 5
Question 21.
7 + ____ = 14
Answer:
7 + 7 = 14
Explanation:
The sum of equal addends of 14 are 7 and 7
Problem Solving
Question 22.
Liam has 5 dogs. Each dog has 4 bones. How many bones do the dogs have in all?
_____ bones
Answer:
Given,
Liam has 5 dogs. Each dog has 4 bones.
1 dog = 4 bones
5 dogs = 5 × 4 = 20 bones
5 dogs have 20 bones.
Question 23.
Lauren has 3 pages of stamps. Each page has 5 stamps on it. How many stamps does Lauren have ¡n all?
____ stamps
Answer:
15 stamps
Explanation:
Lauren has 3 pages of stamps.
Each page has 5 stamps on it.
3 x 5 = 15
15 stamps that Lauren have ¡n all.
Question 24.
Jonah has an even number of golf balls. He has more than 13 and less than 16 golf balls. How many golf balls does he have?
____ golf balls
Answer:
14 golf balls
Explanation:
more than 13 and less than 16 golf balls.
The even number between 13 and 16 is 14
so, 14 golf balls
Test Practice
Question 25.
Katherine has skip counted 16 rubber bracelets by 2s. If she continues skip counting by 2s, how many does she have after counting 5 more sets?
(A) 20
(B) 21
(C) 24
(D) 26
Answer:
D
Explanation:
Katherine has skip counted 16 rubber bracelets by 2s.
If she continues skip counting by 2s,
5 more sets by 2 is 10
16 + 10 = 26
Reflect
Show how equal groups help you.
Write a repeated addition sentence that describes the cubes.
Shade the array to show 4 rows of 5.
Explanation:
Essential Question?
How can equal groups help me add?
Skip count by 5s. What are the missing numbers?
40, ___, ____, 55
Explanation:
The given pattern is skip by 5
40 + 5 = 45
45 + 5 = 50
40, 45, 50, 55
Circle pairs.
Is the number of counters even or odd?
Explanation:
The color count is an even