Math 6 Chapter 1 Lesson 11: Sign divisible by 2, by 5
1. Summary of theory Tóm
1.1. Opening comments.
We see: \(90 = 9 . 10 = 9 . 2 . 5 \) divisible by 2, by 5;
\(610 = 61 . 10 = 61 . 2 . 5\) divisible by 2, by 5;
\(1240 = 124 . 10 = 124 . 2 . 5\)divisible by 2, by 5.
Comment: Numbers ending in 0 are both divisible by 2 and divisible by 5.
1.2. The sign is divisible by 2.
VD: Consider the number n = \(\overline{43*}\)
We write: n = \(\overline{43*} = 430 + *\)
If * is the numbers 0, 2, 4, 6, 8 (even digits), then n is divisible by 2.
If * is the digits 1, 3, 5, 7, 9 (which are odd digits), then n is not divisible by 2.
Conclude: Numbers ending in an even digit are divisible by 2 and only those numbers are divisible by 2.
1.3. The sign is divisible by 5.
Reuse VD \(n = \overline{43*}\)
If * is the digits 0 or 5 then n is divisible by 5.
If * is a digit other than 0 or 5, then n is not divisible by 5.
Conclude: Numbers ending in 0 or 5 are divisible by 5 and only those numbers are divisible by 5.
2. Illustrated exercise
Question 1: Which of the numbers 115, 234, 560, 238, 137 is divisible by 2 and which is divisible by 5?
Solution guide:
234, 238, 560 is divisible by 2 because it ends with even digits 4, 8 and 0.
115, 560 are divisible by 5 because the last digits are 0 and 5.
Verse 2: Consider the total \(126 + 148\) Is it divisible by 2?
Solution guide:
126 ends in 6 so it is divisible by 2
148 ends in 8 so it’s divisible by 2
So sum \(126 +148\) divisible by 2.
Question 3: Use three digits 4, 0, 5 to combine to form natural numbers divisible by 2
Solution guide:
Of the three given digits, only 4 and 0 are divisible by 2, so the natural numbers divisible by 2 are: 504, 540, 450.
3. Practice
3.1. Essay exercises
Question 1: Which of the numbers 235, 356, 790, 358, 257 is divisible by 2 and which is divisible by 5?
Verse 2: Consider the total \(126 + 148\) Is it divisible by 2?
Question 3: Use three digits 7, 8, 0 to combine to make natural numbers divisible by 2
3.2. Multiple choice exercises Bài
Question 1: Considering the number \(\overline{13*}\) replaces the * with which digit, then \(\overline{13*}\) is divisible by 5?
A. 1; 2
B. 2; 3
C. 0; 5
D. 3; 4
Verse 2: Considering the number \(\overline{13*}\) replaces * by what digit, then \(\overline{13*}\) is divisible by 2?
A. 0; 2; 4; 6; 8
B. 0; first; 3; 5; 7
C. 0; first; 2; 3; 4
D. 5; 6; 7; 8; 9
Question 3: Given the number 137; 244; 178; 120. What are the numbers divisible by 2?
A. 120; 137; 244
B. 178; 120; 137
C. 137; 244; 120
D. 244; 178; 120
Question 4: N is a 3digit natural number where the last digit is 0, so is N divisible by?
A. 2
B. 5
C. 2 and 5
D. Don’t spend on any number at all.
Question 5: For the numbers 120; 132; 144; 155; 168; 179. What is divisible by 5?
A. 120; 132
B. 120; 155.
C. 155; 168.
D. 155; 179.
Question 6: For the numbers 120; 132; 144; 155; 168; 179. What is divisible by 5?
A. 120; 132
B. 120; 155.
C. 155; 168.
D. 155; 179.
4. Conclusion
Through this lesson, Signs are divisible by 2, by 5, you need to complete some of the goals that the lesson gives, such as:

Recognize the signs of divisibility by 2, by 5.

Do related exercises.
.
=============
Leave a Reply