## Key Concepts

- Compare situations.
- Word problems on comparing situations.

**Introduction:**

There are eight birds on a tree.

3 birds flew away.

How many birds are left on the tree?

Use cubes to find.

8 is whole.

Now we need to take 3 from 8.

Subtract 3 from 8, we get

8 – 3 = ____

Now write the difference between the numbers.

Subtraction equation is

8 – 3 = 5

There are 5 birds left on the tree.

There are 10 books in a bag.

4 books are taken out.

How many books are left in the bag?

Use cubes to find.

10 is whole.

Now we need to take 4 from 10

Subtract 4 from 10, we get

10 – 4 = ____

Now write the difference between the numbers.

Subtraction equation is

10 – 4 = 6

There are 6 books left in the bag.

Take from Real Life:

### Check Our Understanding:

- There are 6 apples on the tree. 4 apples have fallen on the ground. How many apples are left on the tree?

Answer:

6 – 4 = 2

- Observe the picture and find the number of birds flying away if there are 8 birds at first.

Answer:

8 – __ = 6

8 – 6 = 2

- There are 7 fish in a pond. 5 fish died during fishing. How many fish are alive in the pond?

Answer:

7 – 5 = 2

- Observe the picture and find the number of glasses of orange juice is over. If there are 9 glasses of orange juice initially.

9 – 4 = 5

## Exercise

- There are 3 bats in a cave. If 2 bats went outside, how many bats are there inside?
- There are 4 birds on a tree. If 2 are flying, how many are on the tree?
- There are 10 flowers in a plant. If some flowers are plucked, 6 flowers are there in the plant, how many flowers are plucked?
- There are 8 seeds in a pouch. If 5 seeds are planted, how many are left in the pouch?
- There are 6 toys in a bag. If 5 are taken out of the bag, how many are inside the bag?
- There are 5 people in a class. If 2 people went out, how many are there in the class?
- There are 9 apples on the tree. 4 apples have fallen, how many are on the tree?
- There are 7 cats on a wall. If 5 cats are jumping on the bed, how many are on the wall? Write the equation.
- There are 7 bats in the cave. If 3 bats went out, how many are there inside the cave? Write the equation.
- There are 10 mats in a cupboard. If 5 mats are taken out, how many are inside the cupboard? Write the equation.

### Concept Map:

### What we have learned

- Subtraction word problems.
- Subtraction equation.

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