#### Introduction:

Strategies to add numbers:

- By using models
- By using a hundred chart
- By using an open number line
- By using place value,

**1. By using models:**

Find 26 + 32 = ?

**Solution: **

26 + 32 = 58

**2. By using a hundred charts:**

Find 3 + 40 = ?

**Solution: **

3 + 40 = 43

**3. By using a number line:**

Find 34 + 20 = ?

**Solution: **

34 + 20 = 54

#### 4. **By using place value:**

Find 24 + 19 = ?

**Solution: **

First, add the ones and then the tens.

There are 4 tens and 3 ones.

24 + 19 = 43

So, we have seen different strategies to add numbers.

In this session, we are going to learn to solve word problems by using any one of the strategies.

### Model with Math:

**Example 1:**

Matt has 14 toy cars and 18 toy jeeps. How many toy cars and jeeps he has now? Use models to solve the answer.

**Solution:**

14 + 18 = ?

Add ones.

4 ones + 8 ones = 12 ones

12 ones has 1 ten and 2 ones.

Add tens.

1 ten + 1 ten + 1 ten = 3 tens

3 tens + 2 ones = 32

So, Matt has 32 toy vehicles in all.

**Example 2:**

Amy bought 19 red rose plants, and 25 white rose plants for her garden. How many rose plants did she buy? Use a number line to solve the problem.

**Solution:**

19 + 25 = ?

Start counting from 25.

19 has 1 ten and 9 ones.

25 + 10 = 35

Break 9 into 5 and 4.

35 + 5 = 40

40 + 4 = 44

So, 19 + 25 = 44

So, Amy bought a total of 44 rose plants.

**Example 3:**

There are 37 apples in the box. Rachel buys 19 more apples. How many apples are there in the box now?

**Solution:**

The total number of apples in the box = 37 + 19

37 + 19 = ?

Add ones.

7 ones + 9 ones = 16 ones

16 ones has 1 ten and 6 ones.

Add tens.

3 tens + 1 ten + 1 ten = 5 tens

5 tens + 6 ones = 56

So, there are 56 apples in the box.

#### Exercise:

- Mary asks 34 students about their project work on Monday. She asks 19 students about their project on Tuesday. How many students did she ask on both days?
- There are 25 chefs and 18 servants in the restaurant. How many people are working in the restaurant?
- At a wedding, 56 cups of corn soup and 34 cups of mushroom soup were prepared. How many cups of soups were prepared.?
- Amy writes 28 pages on Monday. Then he writes 17 pages on Tuesday. How many pages did she write in two days?
- Ben has 15 red cars and 26 blue cars. How many cars does Ben have in all?
- Ellen has 37 stickers. Her brother gave him 19 stickers. How many stickers does Ellen have in all?
- Mike has 47 brown pebbles and 18 blue pebbles. How many pebbles does he have now?
- There are 47 lions and 34 tigers in the wild animal national park. How many lions and tigers are there in total?
- There are 19 apples and 27 strawberries in the fruit basket. How many fruits are there in total?
- Amy picks 16 roses. Roger picks 48 tulips. How many flowers do Amy and roger pick in all?

#### Concept Map:

#### What We Learnt:

- We learned to solve an addition problem by drawing a picture and writing an equation.

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