How Is the Number 20 Used in Everyday Math?
Say Hello to 20!
Oh yes! You score 20 out of 20 in a unit test. Wow! That feeling is amazing. Isn’t it? But do you know what 20 is? Well, 20 is a natural number. It is written as ‘twenty’ in numbers. Can you recall where you heard the number 20? 20-20 cricket matches or especially when your mother yelled at you….. “I told you twenty times that don't do this, you moron.” Hey, do not laugh!
In this article, you will learn what is 20 and some interesting facts related to 20.
What does 20 mean in Maths
What is Number 20?
20 is a cardinal number. The number 20 is the successor of 19 and the predecessor of 21. It is an even number. This natural number is written as XX in the Roman numeral. Number 20 is formed from the word of Old English ‘twentig’, from the base of two + -ty.
Number 20 can be written as the following in place value chart:
Number ‘20’ in Mathematics
Factors of 20 are 1, 2, 4, 5, 10, and 20 because 20 can be written as:
20 = 1 x 20
20 = 2 x 10
20 = 4 x 5
Number 20 is a pronic number as it is the multiplication of two consecutive numbers, i.e., 4 and 5.
20 = 4 x 5
Number 20 is the sum of four consecutive even numbers, i.e.,
20 = 2 + 4 + 6 + 8
In Geometry, the figure which has 20 sides is called an icosagon or 20-gon. Also, an icosahedron has 20 faces and a dodecahedron has 20 vertices.
20 is the sum of three Fibonacci numbers, i.e., 20 = 13 + 5 + 2. Fibonacci numbers are extracted from the Fibonacci series which are formed by adding two previous numbers, which usually started from 0 and 1.
Like the decimal number system based on 10, the vigesimal or base-20 number system is based on 20.
8 p.m. is written as 20:00 hours in the 24-hour clock system.
Do You Know?
20 is the atomic number of calcium (Ca).
‘Twenties’ is used to show the period of a person’s life from age 20 to 29. It is also used to represent the 20th century.
Number 20 is used as an index in measuring visual acuity in some countries, just like the 6/6 index. (Can you tell which index is used in your country?)
India won the first Twenty 20 World Cup. Let’s cheer!
Complete the Following Patterns
1. 10 + …… = 20
2. …… + 7 = 20
3. …… - 5 = 20
4. 30 - …… = 20
5. 5 x …… = 20
6. 40 ÷ …… = 20
Answers:
1. 10
2. 13
3. 25
4. 10
5. 4
6. 2
Conclusion
We hope that this article helped you to understand the number ‘20’. Understanding the concept of the number ‘20’ will be helpful for the kids as it will help them to solve the complex Maths calculations. To know more about other numbers and Mathematical concepts, explore our website.
FAQs on What Does 20 Mean in Math?
1. What does the number 20 mean in Maths?
In Maths, the number 20 represents a count or value of twenty items. It is a whole number that comes after 19 and before 21. It is made up of two tens and zero ones (20 = 2 tens + 0 ones). For example, if you have two packs of ten pencils each, you have 20 pencils in total.
2. How do you write the number 20 in words?
The number 20 is written as "Twenty" in words. When you see the digits '2' and '0' together as 20, you should read it as twenty.
3. Is 20 an even or odd number? Why?
The number 20 is an even number. A number is considered even if it can be perfectly divided into two equal groups with nothing left over. For example, 20 can be divided into two groups of 10 (10 + 10 = 20). As a rule, all whole numbers ending in 0, 2, 4, 6, or 8 are even.
4. Why is 20 an important number for learning about place value?
The number 20 is very important for understanding place value as it is a foundational example of a two-digit number where the tens place is not one. It clearly shows how our number system is based on groups of ten. In the number 20:
- The digit '2' is in the tens place, which means it represents two groups of ten.
- The digit '0' is in the ones place, signifying there are no extra ones.
5. What comes just before and after the number 20?
In number counting, the number that comes just before 20 is 19 (nineteen). The number that comes just after 20 is 21 (twenty-one). Understanding this sequence (19, 20, 21) is a key part of learning number order.
6. What are some real-world examples of the number 20?
You can find the number 20 in many places in everyday life, which helps in understanding its value. For example:
- A twenty-rupee note is a common form of currency.
- The date on a calendar, such as the 20th of a month.
- A T20 cricket match has 20 overs per team.
- Counting all your fingers and toes together gives a total of 20.
7. What are some different ways to make the number 20 using addition?
Making 20 by adding other numbers is an excellent way to practise addition. There are many combinations. Some common examples include:
- 10 + 10 = 20
- 19 + 1 = 20
- 15 + 5 = 20
- 18 + 2 = 20
8. How is the number 20 different from the number 2?
The number 20 and the number 2 are very different due to place value. The number 2 simply means two single items (2 ones). However, the number 20 means two groups of ten (2 tens and 0 ones). Therefore, 20 is ten times bigger than 2. For instance, having 2 pencils is very different from having 20 pencils.
9. What does 20 mean in multiplication tables?
In multiplication, 20 appears as a product in several multiplication tables. This shows how it can be formed by equal groups. For example:
- 2 x 10 = 20 (from the 2 and 10 times tables)
- 4 x 5 = 20 (from the 4 and 5 times tables)
- 5 x 4 = 20 (from the 5 and 4 times tables)
- 10 x 2 = 20 (from the 10 and 2 times tables)
