Go through the Spectrum Math Grade 2 Answer Key Chapter 1 Posttest and get the proper assistance needed during your homework.

Understanding and Using Numbers

Count by 2.

2, ____, ___, 8, ___, _____

Explanation:
First number is given as 2. If we count by 2, then a 2 should be added to the first number to get the second number which means 2 + 2 = 4. Similarly, for the third number, we need to add one more 2 to the second number which means 4 + 2 = 6. It was given that fourth number is 8 which is expected. Now, for the fifth number, we need to add 2 more to the fourth number which means 8 + 2 = 10. In the same way, the sixth number will be 10 + 2 = 12.

Count by 5.

5, ____, ___, 20, ____, ____

Explanation:
First coin is given as 5. If we count by 5, then a 5 should be added to the first coin score to get the second coin which means 5 + 5 = 10. Similarly, for the third coin, we need to add one more 5 to the second coin score which means 10 + 5 = 15. It was given that the score of fourth coin is 20 which is expected. Now, for the fifth coin, we need to add 5 more to the score of fourth coin which means 20 + 5 = 25. In the same way, the score of sixth coin will be 25 + 5 = 30.

Count by 10.
30, ___, ___, ___,70, 80, ____
30, 40, 50, 60, 70, 80, 90
Explanation:
First number is given as 30. If we count by 10, then a 10 should be added to the first number to get the second number which means 30 + 10 = 40. Similarly, for the third number, we need to add one more 10 to the second number which means 40 + 10 = 50. Now, for the fourth number, we need to add 10 more to the third number which means 50 + 10 = 60. It was given that fifth and sixth numbers are 70, 80 which is expected. In the same way, the seventh number will be 80 + 10 = 90.

Write an equation to match each array.

___ + ____ + ____ + ____ + ___ = ____

Explanation:
The total number of objects given in the first, second, third, fourth and fifth lines are respectively five each. To match the array, we need to add number of objects in all rows which is equal to the total number of objects given. The total number of objects given are 25.

____ + ____ = _____

Explanation:
The total number of Teddybear’s given in the first, and second lines are respectively three each. To match the array, we need to add number of Teddybear’s in all rows which is equal to the total number of teddy bears given. The total number of teddy bears given are 6.

Write an equation to match each array.

___ + ____ + ____ + ____ = _____

Explanation:
The total number of books given in the first, second, third and fourth lines are respectively five each. To match the array, we need to add number of books in all rows which is equal to the total number of books given. The total number of books given are 20.

____ + ____ + ____ = ____

Explanation:
The total number of fish given in the first, second and third lines are respectively five each. To match the array, we need to add number of fish in all rows which is equal to the total number of fish given. The total number of fish given are 15.

Tell how many. Label odd or even. Write an equation.

____ green circles
_______
____ + ____ = _____
9 green circles
Odd
9 + 0 = 9
Explanation:
The total number of green circles are nine. Any number which is not divisible by two is called an odd number. The number nine is not divisible by two and so the number of green circles given are odd. The equation is written as 9 + 0 = 9.

_____ yellow stars
_________
____ + ____ = ____
10 yellow stars
Even
10 + 0 = 10
Explanation:
The total number of yellow stars are ten. Any number which is divisible by two is called an even number. The number ten is divisible by two and so the number of yellow stars given are even. The equation is written as 10 + 0 = 10.

____ purple triangle
______
____ + ____ = ____
1 purple triangle
Odd
1 + 0 = 1
Explanation:
The total number of purple triangles is one. Any number which is not divisible by two is called an odd number. The number one is not divisible by two and so the number of purple triangles given are odd. The equation is written as 1 + 0 = 1.

____ orange hexagons
_______
____ + ____ = ____
5 orange hexagons
Odd
5 + 0 = 5
Explanation:
The total number of orange hexagons are five. Any number which is not divisible by two is called an odd number. The number five is not divisible by two and so the number of orange hexagons given are odd. The equation is written as 5 + 0 = 5.

____ red squares
______
_____ + ____ = _____
6 red squares
Even
6 + 0 = 6
Explanation:
The total number of red squares are six. Any number which is divisible by two is called an even number. The number six is divisible by two and so the number of red squares given are even. The equation is written as 6 + 0 = 6.

____ teddy bears
______
____ + ____ = ______