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Guide to solving exercises on page 22 Math 4, including solution methods
1. Solve Exercise 1 on page 22 of the 4th-grade math textbook - Practice
Problem:
a) Write the smallest number: with one digit, with two digits; with three digits.
b) Write the largest number: with one digit; with two digits; with three digits.
Solution Method:
Apply the previously learned theoretical knowledge about natural numbers to determine the correct answers.
Answer:
a)
The smallest number with one digit is: 0
The smallest number with two digits is: 10
The smallest number with three digits is: 100
b)
The largest number with one digit is: 9;
The largest number with two digits is: 99;
The largest number with three digits is: 999.
2. Solve Exercise 2 on page 22 of the 4th-grade math textbook - Practice
Problem:
a) How many numbers have one digit?
b) How many numbers have two digits?
Solution Method:
- Observation:
+ Numbers with one digit include numbers from 0 to 9.
+ Numbers with two digits include numbers from 10 to 99.
- Solution Approach: To find the number of terms in the sequence, apply the formula:
Number of terms = (Largest term - Smallest term) : d + 1
Answer:
a) Numbers with one digit are: 0; 1; 2; 3; 4; 5; 6; 7; 8; 9.
So, there are 10 numbers with one digit.
b) Numbers with two digits are: 10; 11; 12; 13; ...; 97; 98; 99.
So, there are 90 numbers with two digits.
3. Solve Exercise 3 on page 22 of the 4th-grade math textbook - Practice
Solution Method:
For this exercise, the given pairs of numbers have equal digit counts, and the digits outside the blank cells are the same. Thus, we only need to compare the digit to be found (blank cell) with the digit in the same position in the known number, as required by the exercise.
Answer:
a) The suitable number to fill in the blank is: 0
b) The suitable number to fill in the blank is: 9;
c) The suitable number to fill in the blank is: 9;
d) The suitable number to fill in the blank is: 2.
4. Guide to solve Exercise 4 on page 22 of the 4th-grade math textbook - Practice
Phương pháp giải:
- For part a), find all natural numbers less than 5.
- For part b), find natural numbers that satisfy both conditions: Less than 5 and greater than 2.
Answer:
a) Natural numbers less than 5 are: 0; 1; 2; 3; 4.
So, x to be found is: 0, 1, 2, 3, 4.
b) Natural numbers greater than 2 and less than 5 are: 3; 4;
So, x to be found is: 3; 4.
In the previous exercise, you became familiar with solving 4th-grade math Exercise 1, 2 on page 20 of the textbook - Writing natural numbers in the decimal system. Solving 4th-grade math becomes easier when applying study materials like Solve Math 4 page 22 in the textbook - Practice, Compare, and Order Natural Numbers. Here, revision and self-study are more effective, and you can refer to the guide to solve exercises 1 to 5 on page 22 of the 4th-grade math textbook, presented in detail and easy to understand. With these guides, we hope that students will learn and reinforce their knowledge most effectively.
In the next lesson, we will explore solving 4th-grade math Exercise 1, 2, 3, 4 on page 23 of the textbook - Yen, Ta, Tan. Stay tuned to understand and master the units of mass measurement in the upcoming lesson.
Solving exercises 1 to 5 on page 22 of the 4th-grade Math textbook
- Solve question 1 on page 22 of the 4th-grade Math textbook
- Solve question 2 on page 22 of the 4th-grade Math textbook
- Solve question 3 on page 22 of the 4th-grade Math textbook
- Solve question 4 on page 22 of the 4th-grade Math textbook
- Solve question 5 on page 22 of the 4th-grade Math textbook
Here is the solution for Exercise 22 on page 22 of the 4th-grade Math textbook in the section of solving 4th-grade math exercises. Students can review the previously solved Exercise 20 on page 20 of the 4th-grade Math textbook or preview the solution for Exercise 22 on page 22 to excel in 4th-grade Math.
Natural numbers Grade 4 Practice on page 26 of the 4th-grade Math textbook is an important lesson in Chapter I. Check out the hints for solving Math 4 page 26 to better understand the knowledge.
Grade 4 natural numbers in Chapter I, students study the continuation of the Chart lesson. To excel in 4th-grade Math, solve Math 4 page 30, 31, 32 before attending class for better understanding.
