Find one of the equal parts of a number

### 1.1. Knowledge to remember

**Problem:** I have 12 candies, I give you \(\frac{1}{3}\) those candies. Ask me to give you some candies?

*Comment:*

Divide 12 candies into 3 equal parts.

Each of those parts is \(\frac{1}{3}\) the number of candies.

*Solution*

I gave you the number of candies:

12 : 3 = 4 (piece)

Answer: 4 candies

### 1.2. Solving Textbook Exercises

**Lesson 1:** Write the correct number in the dot?

a) \(\frac{1}{2}\) of \(8kg\) is … \(kg\) ; b) \(\frac{1}{4}\) of \(24l\) is … \(l\) ;

c) \(\frac{1}{5}\) of \(35m\) is … \(m\) ; d) \(\frac{1}{6}\) of \(54\) minutes is … minutes.

**Solution guide:**

To find \(\frac{1}{a}\) of the number \(b\) we take \(b:a\)

a) \(\frac{1}{2}\) of \(8kg\) is \(4\) kg ; b) \(\frac{1}{4}\) of \(24l\) is \(6\) \(l\) ;

c) \(\frac{1}{5}\) of \(35m\) is \(7m\) ; d) \(\frac{1}{6}\) of \(54\) minutes is \(9\) minutes.

**Lesson 2:** A shop has 40m of blue fabric and has sold \(\frac{1}{5}\) of that fabric. How many meters of blue cloth did that store sell?

**Solution guide:**

*Summary*

Yes: 40m blue fabric vải

Sold: \(\frac{1}{5}\) fabric number

Sold: … m blue fabric?

*Solution*

The number of meters of green fabric sold by the store is:

$8\phantom{\rule{0ex}{0ex}}(m)$

Answer:

$8$meter blue fabric

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