Practice solving math problems

### 1.1. Knowledge to remember

- Review the subtraction of two-digit numbers.
- Review the subtraction of three-digit numbers.

### 1.2. Solving Textbook Exercises

**Lesson 1:** Team One can plant

trees, Team Two planted more trees than Team One

$90$tree. How many trees can Team Two plant?

**Solution guide:**

- The number of trees planted by Team Two is equal to the number of plants that Team One planted plus

$90$tree.

- Summary:

**Solution**

The number of plants that Team Two can plant is:

(tree)

Answer:

tree**Lesson 2: **A morning shop sells

gasoline, sold less in the afternoon than in the morning

$128l$gasoline. How many liters of gasoline did that store sell in the afternoon?

**Solution guide:**

- Selling less in the afternoon than in the morning, so if we want to find how many liters of gasoline we will sell in the afternoon, we perform the subtraction
- Summary:

**Solution**

The number of liters of gasoline sold in the afternoon is:

$7\phantom{\rule{0ex}{0ex}}$

(liter)

Answer:

Liter of gasoline**Lesson 3:** Solve the problem (according to the model)

a) The top row has 7 oranges, the bottom row has 5 oranges. How many oranges are there in the top row than the bottom row?

Form:

The number of oranges in the top row is more than the number of oranges in the bottom row: (fruit) Answer: 2 oranges |

b) Class 3A has

$19$female friends and

$16$boy friend. How many more female friends than male friends?

**Solution guide:**

*Summary:*

Have:

$19$boy friend

Have:

$16$girlfriend

More female than male: … you?

*Solution*

The number of female friends is more than the number of male friends:

(friend)

Answer:

$3$friend

**Lesson 4:** Weight bag of rice

kg, bag of corn weight

$35$kg. How many kilograms lighter is a bag of corn than a bag of rice?

**Solution guide:**

*Summary:*

Rice bag:

kgBag of corn:

kgA bag of corn is lighter than a bag of rice: … kg?

*Solution*

The number of kilograms of a bag of corn lighter than a bag of rice is:

$(kg)$

Answer: 15 kg

.

=====

## Leave a Reply