How to Find and Definition of Missing Numbers

In a given set of numbers, missing numbers are absent from the set while having relative differences. Finding comparable alterations between the numbers and filling in their missing values in their respective series and locations is how the missing numbers are written.

We’ll show you how to fill the gaps in sequences and series using the Missing Number Problem in this post.

  • Lines of Numbers.

In mathematics, “number lines” exist where the integers are spaced uniformly apart on a horizontal straight line. The two ends of a number line carry on indefinitely as a visual representation of all the numbers in a specific sequence.

Numbers on a Number Line:

On a number line, the arithmetic operations of numbers are more easily understood. Identifying numbers on a number line is the first step. A number line has zero in the centre. On the number line, all positive numbers are located to the right of zero, whereas all negative numbers are located to the left of zero. 

The value of a number falls as we travel to the left. So, for example, 1, when multiplied by 2, equals 2. Integers, fractions, and decimals may all be represented visually on a number line. To discover more, click on the following links.

  • Cardinal Numbers.

Numbers in the Arabic Numeral System:

These birds, known as Cardinals, have a variety of other names, including “cardinal numerals.” Instead of fractions, the counting numbers known as cardinal numbers are the ones that begin with 1 and go on indefinitely.

‘Number’ or ‘quantity’ is what Cardinals refer to when discussing a collection. Numbers like 1, 2, 3, 4, 5, etc., may be used to determine the number of apples in a basket. 

You may determine quantities of items and people by looking at the numbers. A cardinal number is assigned to each of the ordinal numbers.

Examples of Cardinal Numbers:

The total number of items in a group may be expressed as the group’s cardinality.

  • The cabinet has six items of clothing.
  • A lane has four vehicles in it.
  • There are two dogs and a cat in Anusha’s home as pets.

In the cases above, the cardinal numbers are 6, 4, 2 and 1. Regardless of their sequence, it just represents the amount of anything. It specifies the size of a set but does not consider the order in which it is presented.

The natural numbers that define cardinality are the set of finite numbers. When it comes to the size of infinite sets, infinite cardinals is the best analogy. The cardinals don’t use decimals or fractions; they just use the count of the number.

  • Fibonacci Numbers

Where do you get this number from, and what is it used for?

If you combine the two previous numbers, you’ll get a Fibonacci sequence of numbers. In this case, two preceding numbers are added together to get the next number in the series. Let 0 and 1 be the first two numbers in the series. By putting 0 and 1 together, we obtain 1. 

Finally, by combining numbers one through three (1, 1, 1), we arrive at the fourth number (i.e., 2). As a result, the Fibonacci sequence is 0, 1, 1, 2, 3, 5, 8,……. That’s why it’s called the Fibonacci sequence.

The Formula for Fibonacci Numbers:

The Fibonacci sequence may be defined as follows:

Fn is the sum of Fn-1 and Fn-2

Fn is the nth word or number here.

One of the first terms of Fn-1 is (n-1).

It’s the (n-2)nd time we’ve seen Fn2.

  • Numerical Cubes’ Root.

Using the prime factorisation technique, you may discover the cube root of an integer. The “sign is used to represent the cube root. An example of this is 8 = (2 x 2 x 2) = 23. Because 8 is a perfect cube number, finding the cube root of an integer is a simple matter.

It’s a bit of a challenge to get the cubic root of a non-perfect cube number, but it’s not impossible. You may find a number’s cube root by multiplying it three times by the number’s original value.


What is the cube root of any number, such as “a”? The answer is “b.”

b3 is equal to a

Alternatively, this might be written as follows:

an is equal to b in this context.

What is the Cube Root Method?

The cube root is the opposite of the cube calculation, and the symbol for it is ‘.’ The following are some instances we may look at.

You’ll need a number that can be multiplied by itself three times to determine the cube root of 27. We could write,

Three times three times three equals 33.

Using the square root on both the left and right sides;

Alternatively, 27 = 33

As a result, 27’s cube root is 3.

Problems with Missing Numbers

Find the missing numbers by solving the questions below.

  1. In the specified order, fill in the missing number.

3, 18,?, 2, 3, 6, 4, 5, 20,


Six is the answer to the mystery number.

As a result of this, it is possible to identify the connection between the numbers in the provided series, such as the third-digit ‘6’ which is the product of the first- and third digits, and the sixth-digit “20” which is the product of fourth-digit “4” and fifth-diameter “5”.

Because of this, the seventh digit should be “6”.

3, 6, 5, 20, 6, 3, 18 are the numbers in the sequence.

  1. Figure out the number in the following number line is missing: 1, 3, 9, 15, 25,? 49, as an example.


The missing number has been discovered to be 35.

Due to all integers being squares and (squares – 1) alternately, this is why.

One square is equal to one.

Two square is equal to 4. Thus 4 – 1 is equal to 3.

The sum of three squares is nine

When you divide 16 by one, you get 15.

The sum of the squares of 5 is 25,

Six square is equal to 36. Thus 36 – 1 is 35.

49 is the sum of the squares in each row and column.

There will be a total of 49 numbers on the number line.

  1. How to solve this problem: Find the missing number in the following sequence 5, 7, 11,?


Found to be the missing digit is number 13.

The prime numbers 5, 7, 11, 13, 17, and 19 are divisible only by ‘1’ and themselves in the provided number sequences.

As a result, the number line series will be 5, 7, 11, 13, 17, and 19.


I hope you learned a lot about missing numbers from this article.

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