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.

Answer: 0 boxes

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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? ____________

Answer:

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? ____________

Answer:

The tortoise are more.

The total number of star fish=4

The total number of tortoise=8

The tortoise is 4 more than starfish

Starfish are fewer.

The starfish are 4 fewer than tortoise.