Round numbers from 110 to 200

### 1.1. Knowledge to remember

– Order of round numbers from 110 to 200

– How to read and write those numbers; Compare the values of round numbers.

### 1.2. Math forms

**Type 1: Read and write three-digit round numbers.**

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

– From reading numbers, I can write a three-digit round number satisfying.

– A round number is a number whose units is the digit 0.

**Form 2: Comparison of round numbers**

Numbers with fewer digits have a smaller value.

– Numbers with the same number of digits compare the rows from left to right.

**Form 3: Order of round numbers.**

Remember the order of the round numbers in the range 110 to 200 is:

110; 120; 130; 140; 150; 160; 170; 180; 190; 200

### 1.3. Solving Textbook Exercises

**Lesson 1**

Write (according to the form):

__Solution method__

Read the given number from hundreds to units in turn.

__Solution guide__

**Lesson 2**

Enter the sign >; <; = suitable for the blank:

__Solution method__

Compare which number with the larger tens digit is larger.

__Solution guide__

110 < 120 130 < 150

120 > 110 150 > 130

**lesson 3**

Enter the sign >; <; = suitable for the blank:

100…110 180…170

140…140 190…150

150…170 160…130

__Solution method__

Compare which number with the larger tens digit is larger.

__Solution guide__

100 < 110 180 > 170

140 = 140 190 > 150

150 < 170 160 > 130

**Lesson 4**

Number ?

110; …; 130; 140; …; 160; 170; …;…;200

__Solution method__

Count all the numbers up and down, starting from 110 and then fill in the missing number in the blank.

__Solution guide__

Fill in the numbers to get the following sequence:

110; **120**; 130; 140; **150**; 160; 170; **180**; **190**; 200.

**Lesson 5**

Arrange 4 triangles into a quadrangle (see figure):

__Solution method__

Match the given triangles to form a quadrilateral.

__Solution guide__

It can be arranged as follows:

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