Math 6 Chapter 1 Lesson 3: Write natural numbers số
1. Summary of theory Tóm
1.1. Numbers and digits
Form the concept of one-digit numbers, two-digit numbers, three-digit numbers,…
When writing natural numbers with five or more digits, people write each group of three digits from right to left separately for easy reading, for example: 12 345 678
Need to distinguish: Number with digits, number with tens digit, number with hundreds digit…
1.2. Decimal system
The way to write numbers as above is how to write numbers in the decimal system. In the decimal system, every ten units in an element make up one unit in the preceding row.
In addition to the above ways, cpnf has other ways of writing numbers, such as Roman numerals.
Corresponding value in decimal system
2. Illustrated exercise
Question 1: Write the smallest four-digit natural number and write the largest three-digit natural number số
The smallest four-digit natural number is 1000 because
The largest three-digit natural number is 999 .
Verse 2: Write the smallest five-digit natural number with two-digit differences and the largest two-digit natural number with two-digit differences.
The smallest five-digit natural number with a double difference is 10 234 .
The largest natural number that has two digits that are two different from each other is 98 .
Question 3: Given five digits 1; 0; 2; 5; 7
Write the largest five-digit natural number that differs from them
Write the smallest five-digit natural number that differs from that digit
The largest five-digit natural number that differs from those is: 75 210
The smallest five-digit natural number that differs from those is: 10 257
3.1. Essay exercises
Question 1: Write the smallest three-digit natural number and the largest four-digit natural number.
Verse 2: Write the smallest four-digit natural number that is double one and the largest three-digit natural number that differs by one.
Question 3: Given five digits: 1; 3; 5; 7; 9
Write the largest five-digit natural number that differs from those digits.
Write the smallest five-digit natural number that differs from that digit.
3.2. Multiple choice exercises Bài
Question 1: The largest 3-digit 5-digit natural number is
Verse 2: The largest three-digit natural number is:
Question 3: Given a 4-digit natural number 8753. Which of the following statements is false?
A. The tens digit is 5
B. The hundredth is 87
C. 8753 = 8000 + 700 + 50 +3
D. Is the largest 4-digit natural number số
Question 4: The Roman numeral XXVIII corresponds to what value in the decimal system:
Question 5: Given three digits 0, 2, 4. How many 3-digit natural numbers are there whose digits are different?
Through this lesson of Recording natural numbers, students need to complete some of the objectives given by the lesson, such as:
Form the concepts of one-digit numbers and two-digit numbers.
Get familiar with the decimal system.