Write the numbers as the sum of hundreds, tens, and units

### 1.1. Knowledge to remember

Write the number as the sum of hundreds and tens of units and vice versa.

### 1.2. Math forms

**Form 1: Write the number as the sum of hundreds, tens, and units.**

Parse the given number into the sum of the rows.

**Type 2: Find the preceding number (or the number following) of a number and then write that number as a sum.**

* Step 1:* Find the number to sum.

+) The preceding number of a is one unit less than a; The next number of a has a value of one more than a

+) Even numbers are numbers whose units are equal to one of the numbers 0, 2, 4, 6, 8. An odd number is a number whose units are equal to one of the digits 1, 3, 5, 7 and 9.

+) The largest three-digit numbers, the largest three-digit even number has the hundreds digit as 9; The smallest three-digit number is usually 1 .

* Step 2:* Write the number you just found as the sum of hundreds, tens, and units.

**Form 3: Compare numbers within 1000**

Compare two or more three-digit numbers in the order of rows from left to right.

### 1.3. Solving Textbook Exercises

**Lesson 1**

Write (in the form):

__Solution method__

Parse the given three-digit numbers into hundreds, tens, and units.

__Solution guide__

**Lesson 2**

Write the numbers 271, 978, 835, 509 according to the pattern:

**Model: 271 = 200 + 70 + 1**

__Solution method__

Break down the given three-digit numbers into hundreds, tens, and units and write the pattern.

__Solution guide__

271 = 200 + 70 + 1

978 = 900 + 70 + 8

835 = 800 + 30 + 5

509 = 500 + 9

**lesson 3**

What sum is each 975, 731, 980, 505, 632, 842 written into?

__Solution method__

Match the three-digit number with the appropriate sum of hundreds, tens, and units.

__Solution guide__

**Lesson 4**

Arrange 4 triangles to form a boat (see picture):

__Solution method__

Using triangles, rotate and make a boat shape.

__Solution guide__

It can be arranged as follows:

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