Math in Focus Kindergarten Chapter 12 Answer Key Counting On and Counting Back

Go through the Math in Focus Grade K Workbook Answer Key Chapter 12 Counting On and Counting Back to finish your assignments.

Math in Focus Kindergarten Chapter 12 Answer Key Counting On and Counting Back

Lesson 1 Counting On to 10

How many more to make 10? Count and write.

Question 1.

Answer: 4 more needed to make 10.
Explanation:
The counting on addition strategy is a great mental math strategy used to build number fact fluency.  To put it simply, counting involves adding 1, 2 or 3 to a number.
5 + 3, 6 + 2, 8 + 1 are all count on facts. So are 3 + 8, 2 + 14 and 1 + 7.
– Mental math strategy to add two numbers. We start with the biggest number of the numbers to add and count up to the second.
The above-given diagram has 6 boxes are there. To make 10 how many more boxes do we need to add. Assume it as X.
Now we need to find out the value of X.
X=10-6
X=4
therefore 4 more boxes are needed.
Or we can write as:
6+4=10.

Question 2.

Explanation:
The counting on addition strategy is a great mental math strategy used to build number fact fluency.  To put it simply, counting involves adding 1, 2 or 3 to a number.
5 + 3, 6 + 2, 8 + 1 are all count on facts. So are 3 + 8, 2 + 14 and 1 + 7.
– Mental math strategy to add two numbers. We start with the biggest number of the numbers to add and count up to the second.
The above-given diagram has 5 boxes are there. To make 10 how many more boxes do we need to add. Assume it as X.
Now we need to find out the value of X.
X=10-10
X=0
therefore 0 boxes are needed.
Or we can write as:
10+0=10.

Question 3.

Answer: 7 more are needed to make 10.
Explanation:
The counting on addition strategy is a great mental math strategy used to build number fact fluency.  To put it simply, counting involves adding 1, 2 or 3 to a number.
5 + 3, 6 + 2, 8 + 1 are all count on facts. So are 3 + 8, 2 + 14 and 1 + 7.
– Mental math strategy to add two numbers. We start with the biggest number of the numbers to add and count up to the second.
The above-given diagram has 5 boxes are there. To make 10 how many more boxes do we need to add. Assume it as X.
Now we need to find out the value of X.
X=10-3
X=7
therefore 7 more boxes are needed.
Or we can write as:
3+7=10.

Question 4.

Answer: 1 more are needed to make 10.
Explanation:
The counting on addition strategy is a great mental math strategy used to build number fact fluency.  To put it simply, counting involves adding 1, 2 or 3 to a number.
5 + 3, 6 + 2, 8 + 1 are all count on facts. So are 3 + 8, 2 + 14 and 1 + 7.
– Mental math strategy to add two numbers. We start with the biggest number of the numbers to add and count up to the second.
The above-given diagram has 5 boxes are there. To make 10 how many more boxes do we need to add. Assume it as X.
Now we need to find out the value of X.
X=10-9
X=1
therefore 1 more box is needed.
Or we can write as:
9+1=10.

How many more to make 10? Count and write.

Question 5.

Answer: 6 more are needed to make 10.
Explanation:
The counting on addition strategy is a great mental math strategy used to build number fact fluency.  To put it simply, counting involves adding 1, 2 or 3 to a number.
5 + 3, 6 + 2, 8 + 1 are all count on facts. So are 3 + 8, 2 + 14 and 1 + 7.
– Mental math strategy to add two numbers. We start with the biggest number of the numbers to add and count up to the second.
The above-given diagram has 5 boxes are there. To make 10 how many more boxes do we need to add. Assume it as X.
Now we need to find out the value of X.
X=10-4
X=6
therefore 6 more boxes are needed.
Or we can write as:
6+4=10.

Question 6.

Answer: 3 more needed to make 10.
Explanation:
The counting on addition strategy is a great mental math strategy used to build number fact fluency.  To put it simply, counting involves adding 1, 2 or 3 to a number.
5 + 3, 6 + 2, 8 + 1 are all count on facts. So are 3 + 8, 2 + 14 and 1 + 7.
– Mental math strategy to add two numbers. We start with the biggest number of the numbers to add and count up to the second.
The above-given diagram has 5 boxes are there. To make 10 how many more boxes do we need to add. Assume it as X.
Now we need to find out the value of X.
X=10-7
X=3
therefore 3 more boxes are needed.
Or we can write as:
7+3=10.

Question 7.

Answer: 8 more needed to make 10.
Explanation:
The counting on addition strategy is a great mental math strategy used to build number fact fluency.  To put it simply, counting involves adding 1, 2 or 3 to a number.
5 + 3, 6 + 2, 8 + 1 are all count on facts. So are 3 + 8, 2 + 14 and 1 + 7.
– Mental math strategy to add two numbers. We start with the biggest number of the numbers to add and count up to the second.
The above-given diagram has 5 boxes are there. To make 10 how many more boxes do we need to add. Assume it as X.
Now we need to find out the value of X.
X=10-2
X=8
therefore 8 more boxes are needed.
Or we can write as:
2+8=10.

Question 8.

Answer: 9 more needed to make 10.
Explanation:
The counting on addition strategy is a great mental math strategy used to build number fact fluency.  To put it simply, counting involves adding 1, 2 or 3 to a number.
5 + 3, 6 + 2, 8 + 1 are all count on facts. So are 3 + 8, 2 + 14 and 1 + 7.
– Mental math strategy to add two numbers. We start with the biggest number of the numbers to add and count up to the second.
The above-given diagram has 5 boxes are there. To make 10 how many more boxes do we need to add. Assume it as X.
Now we need to find out the value of X.
X=10-1
X=9
therefore 9 more boxes are needed.
Or we can write as:
9+1=10.

Question 9.

Answer: 5 more needed to make 10.
Explanation:
The counting on addition strategy is a great mental math strategy used to build number fact fluency.  To put it simply, counting involves adding 1, 2 or 3 to a number.
5 + 3, 6 + 2, 8 + 1 are all count on facts. So are 3 + 8, 2 + 14 and 1 + 7.
– Mental math strategy to add two numbers. We start with the biggest number of the numbers to add and count up to the second.
The above-given diagram has 5 boxes are there. To make 10 how many more boxes do we need to add. Assume it as X.
Now we need to find out the value of X.
X=10-5
X=5
therefore 5 more boxes are needed.
Or we can write as:
5+5=10.

Lesson 2 Counting Back Using Fingers

Color, count and write.

Question 1.

Explanation:
Above-given 10 flowers and 10 leaves.
But in the box 5 flowers and 5 leaves are there.
5 flowers are given so I coloured 5 circles and counted the remaining circles.
The remaining circles are 5.
Now count the leaves present in the box=5.

Question 2.

Explanation:
Above-given 10 spoons and 10 forks.
But in the box 6 spoons and 4 forks are there.
6 spoons are given so I coloured 6 circles and counted the remaining circles.
The remaining circles are 4.
Now count the forks present in the box=4.

Color, count and write.

Question 3.

Above-given 10 apples and 10 bananas.
But in the box 3 apples and 4 bananas are there.
3 apples are given so I coloured 3 circles and counted the remaining circles.
The remaining circles are 7.
Now count the bananas present in the box=4.

Question 4.

Explanation:
The above-given: 10 shoes and 10 umbrellas.
There are 8 shoes and we need to colour the 8 circles. And we need to count the remaining circles which are not coloured.
The umbrellas present in the box=2.

Lesson 3 Finding Differences Using Fingers

Count, write and circle.

Question 1.

How many more? ____________

How many fewer? ____________

The total number of caps=9
The total number of hats=6
The caps are more than hats.
There are 3 caps more than hats
There are 3 hats less than caps.

Count, write and circle.

Question 2.

How many more? ____________

How many fewer? ____________