Solving 4th-grade math problems on page 98, exercises 1, 2, 3 in the textbook, Divisibility Signs for 3

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Step-by-step guide to solving 4th-grade math problems on page 98 (including solution methods)

1. Solving 4th-grade math problem on page 98 in the textbook, exercise 1

2. Solving 4th-grade math problem 2 on page 98 in the textbook

Solve the problem on page 98, question 4 for 4th-grade students.

Quick Guide to Solve 4th-grade Math on Page 98

Shared document presenting the method to solve 4th-grade math problems on page 98, answers to exercises 1, 2, 3 in the textbook. This is a valuable reference for students studying, understanding how to solve exercises recognizing divisibility signs for 3. With concise and detailed solutions closely aligned with elementary school curriculum, read, explore the article content, and students can grasp the overall knowledge in the textbook and apply problem-solving techniques quickly and easily.

=> Check more excellent 4th-grade math materials here: 4th-grade Math Solutions

Step-by-step guide to solving 4th-grade math problems on page 98 (including solution methods)

1. Solving 4th-grade math problem on page 98 in the textbook, exercise 1

Problem:
Among the following numbers, which ones are divisible by 3?
231; 109; 1872; 8225; 92313

Solution Method:
Divisibility rule for 3: Similar to the divisibility rule for 9, a number whose sum of digits is divisible by 3 is itself divisible by 3.
=> Approach: Add up all the digits in the number, then divide the sum by 3. If it divides evenly, conclude that the number is divisible by 3.

Answer:
+) Number 231 has a digit sum of 2 + 3 + 1 = 6.

Since 6 is divisible by 3, the number 231 is also divisible by 3.

+) The number 109 has a digit sum of 1 + 0 + 9 = 10.

Since 10 is not divisible by 3, the number 109 is not divisible by 3.

+) The number 1872 has a digit sum of 1 + 8 + 7 + 2 = 18.

Since 18 is divisible by 3, the number 1872 is also divisible by 3.

+) The number 8225 has a digit sum of 8 + 2 + 2 + 5 = 17.

Since 17 is not divisible by 3, the number 8225 is not divisible by 3.

+) The number 92,313 has a digit sum of 9 + 2 + 3 + 1 + 3 = 18.

Since 18 is divisible by 3, the number 92,313 is also divisible by 3.

So, among the given numbers, the ones divisible by 3 are:

231; 1872; 92,313.

2. Solving 4th-grade math problem 2 on page 98 in the textbook

Write three three-digit numbers that are divisible by 3

To solve:
Divisibility rule for 3: If the sum of the digits is divisible by 3, the number is divisible by 3.

The answers could be: 351; 648; 891.

Solve the problem on page 98, question 4 for 4th-grade students.

Divisibility Rules Recap:
- Key points to remember:
+ Divisible by 3: The sum of the digits must be divisible by 3.
+ Divisible by 9: The sum of the digits must be divisible by 9.

Answers:

Quick Guide to Solve 4th-grade Math on Page 98

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Explore the solution to the 4th-grade math problem on page 98 in the textbook, curated by Mytour. Additionally, students can review the Practice Solutions for 4th-grade Math on page 98 or preview the Solutions for 4th-grade Math on page 99 to enhance their understanding of the subject. Best wishes for successful learning!

Frequently Asked Questions

What methods can be used to solve 4th-grade math problems on page 98?

To solve 4th-grade math problems on page 98, students can use the divisibility rules, particularly for 3 and 9. For divisibility by 3, add the digits of the number; if the sum is divisible by 3, the number is divisible by 3 as well.

How can I determine if a number is divisible by 3 for 4th-grade math?

To determine if a number is divisible by 3, sum its digits and check if that sum is divisible by 3. For example, the number 231 has a digit sum of 6, which is divisible by 3, confirming that 231 is divisible by 3.

What are some three-digit numbers that are divisible by 3?

Three-digit numbers that are divisible by 3 include 351, 648, and 891. Each of these numbers has a digit sum that is divisible by 3, meeting the criteria for divisibility.

What are the key points to remember about divisibility rules for 4th-grade students?

Key points to remember include that a number is divisible by 3 if the sum of its digits is divisible by 3, and it is divisible by 9 if the sum of its digits is divisible by 9. These rules help in solving various math problems effectively.

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