Solve Exercise 1 on Page 98 of Math 4 Workbook

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Ngày cập nhật gần nhất: 15/4/2026

Solve Exercise 1 on Page 98 of Math 4 Workbook, among the numbers 3451; 4563; 2050; 2229; 3576; 66816.

Guidance for solving Exercise 1 on Page 98 of Math 4 Workbook

Problem:
Among the numbers 3451; 4563; 2050; 2229; 3576; 66816.
a) Which number is divisible by 3?
b) Which number is divisible by 9?
c) Which number is divisible by 3 but not by 9?

Solution Method:
- Divisibility rule for 3: If the sum of the digits is divisible by 3, then the number is divisible by 3.
- Divisibility rule for 9: If the sum of the digits is divisible by 9, then the number is divisible by 9.

Answer:
Number 3451 has a sum of digits equal to 3 + 4 + 5 + 1 = 13;
Number 4563 has a sum of digits equal to 4 + 5 + 6 + 3 = 18;
Number 2050 has a sum of digits equal to 2 + 0 + 5 + 0 = 7;
Number 2229 has a sum of digits equal to 2 + 2 + 2 + 9 = 15;
Number 3576 has a sum of digits equal to 3 + 5 + 7 + 6 = 21;
Number 66816 has a sum of digits equal to 6 + 6 + 8 + 1 + 6 = 27.
Therefore:
a) Numbers divisible by 3 are: 4563; 2229; 3576; 66816.
b) Numbers divisible by 9 are: 4563; 66816.
c) Numbers divisible by 3 but not by 9 are: 2229; 3576.

Section Math 4 Exercise 98 Solution consists of 4 exercises. After solving Exercise 1 on page 98 of Math 4 Workbook, students are encouraged to explore the hints and methods for solving Exercise 2 on Page 98 of Math 4 Workbook, Exercise 3 on Page 98 of Math 4 Workbook, and Exercise 4 on Page 98 of Math 4 Workbook to enhance their understanding of 4th-grade math.

Frequently Asked Questions

What are the rules for determining if a number is divisible by 3?

The rule for determining if a number is divisible by 3 states that if the sum of its digits is divisible by 3, then the number itself is divisible by 3. For example, in exercise 1, the sum of digits of 4563 equals 18, confirming its divisibility.

Which numbers from the list are divisible by 9?

The numbers from the provided list that are divisible by 9 are 4563 and 66816. This is determined by calculating the sum of their digits and checking if that sum is divisible by 9.

How can I identify numbers divisible by 3 but not by 9?

To identify numbers divisible by 3 but not by 9, first check if their digit sum is divisible by 3. Next, ensure that the same sum is not divisible by 9. In exercise 1, the numbers 2229 and 3576 meet these criteria.

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