Number Sense (2 digit numbers) for Class 1

Number Sense

Number sense is understanding and playing with numbers in a way that makes math easier and more fun. With an understanding of number sense, you will be able to tackle any math challenges that come your way.

Number sense helps you do everyday things. When you count how many cookies you have left, or figure out how much time you have until your favorite TV show starts, you're using number sense. To navigate the world of numbers, it functions similarly to your math radar. Now, in this article, we will learn about numbers, one-digit numbers, two-digit numbers, forward counting, backward counting, and place value.

Number

A number is a mathematical quantity used to represent values and perform calculations. Digits are used to symbolize these numbers, which are in the form of symbols ranging from 0 to 9. Numbers play a fundamental role in mathematics and everyday life.

Zero

The number zero is very special in mathematics. A valueless number is zero and it means emptiness.

For example: The image below shows a plate with four apples.
Now, if you remove the four apples, the plate contains 0 apple.

One-digit number

One-digit numbers are formed by using single digits, ranging from 0 to 9.

Two-digit numbers

Combining digits 0 to 9 produces numbers with two digits or more. They can represent numbers from 10 to 99.

Forward Counting

Forward counting is the process of adding one to a number to get the next number in a sequence. It is the process of increasing numbers in a sequential order.

Read About: Addition

Backward Counting

Backward counting is when you start with a number and then decrease it step by step, moving in the opposite direction of counting forward. It is the process of subtracting one from the number to find the number that comes before it.

Before Number

The before number means the number that comes to the left of the given number.
The difference between both numbers is one.

In between Number

A number that lies between or in the middle of the two numbers.

After Number

The after number means the number that comes right after the given number.

This number exceeds the given number by one.

Numbers that come after are always greater than the given number.

Missing Number

Missing numbers are the numbers that have been missed in the given series of numbers with similar patterns among them.

For Example: Find the missing number 3, 6, 9, __, 15, 18;

In this given series, we can see:

3 + 3 = 6; 6 + 3 = 9; 15 + 3 = 18

Here, If we add 3 to a previous number, we will get the next number in the given series.

So, 9 + 3 = 12.

Hence, the required number is 12.

Skip Counting

Skip counting is the process of counting by skipping through a particular number of places in the counting sequence.

The same count must be done each time to skip count.

Example: Skip counting of 2: 2, 4, 6, 8, 10 etc

Place Value

Place value is the value of each digit in a number.

The place value of the tens digit for a two-digit number equals 10 times the value of the digit.

Here, 7 is at the tenth place ;So, the place value of 7 is 7 x 10 = 70 while 4 is at the ones place,so its place value is 4 x 1 = 4 ;

Hence , the number is 70 + 4 = 74.

Here, 5 is at ones place, while 9 is at tens place.

Number Name

To uniquely identify each number, we simply give it a name, which is known as a "number name."

All the numbers from 1 to 100 in words are as follows: