Three-digit numbers

### 1.1. Knowledge to remember

Hundreds, tens, units; How to read and write three-digit numbers.

### 1.2. Math forms

**Type 1: Read and write numbers**

– Read numbers in order of rows from left to right.

– From reading numbers, I write the digits corresponding to the rows and then combine them to get a three-digit number.

**Form 2: Find the number before and after the number of a number**

– The preceding number of A is a number whose value is one unit less than A

– The next number of A is a number that is one unit larger than A.

**Form 3: Compare numbers**

Numbers with fewer digits have a smaller value.

– Two numbers have three digits, you compare the rows from left to right.

### 1.3. Solving Textbook Exercises

**Lesson 1**

Each of the following numbers represents the square in which figure?

__Solution method__

Find the number of squares of each shape and match with the appropriate number.

__Solution guide__

The number 110 indicates the square in figure (d)

The number 205 indicates the square in figure (c)

The number 310 represents the square in figure (a)

The number 132 indicates the square in figure (b)

The number 123 indicates the square in figure (e)

**Lesson 2**

Which reading does each of the following numbers represent?

a) Four hundred and five.

b) Four hundred and fifty.

c) Three hundred and eleven.

d) Three hundred and fifteen.

e) Five hundred and twenty-one.

g) Three hundred and twenty-two.

__Solution method__

Match the three-digit number with the given readings.

__Solution guide__

The number 315 corresponds to the reading d.

The number 311 corresponds to the reading c.

Number 322 corresponds to reading g.

Number 521 corresponds to reading e.

The number 450 corresponds to reading b

Number 405 corresponds to reading a.

**lesson 3**

Write (in the form):

__Solution method__

Read or write three-digit numbers in order from hundreds to units.

__Solution guide__

Take turns writing the numbers in the dots as follows:

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