Mathematics
Grade-4-
Easy
Question
What will be the next number in this series of numbers?
15, 25, 35, 45, _____.
- 50
- 55
- 65
- 75
Hint:
We are given a number series with last term missing. We have to find the rule used to write the pattern and complete the sequence. We will try to find the relation between the first and second term. Using the relation we will find the missing term.
The correct answer is: 55
The given sequence is 15, 25, 35, 45, __
We will subtract the first term from the second term.
We will see if we get a constant that we can use to write the complete pattern.
25 – 15 = 10
Now, we will add this constant to the second term to see if we get the third term. The number sequence of increasing. So, we need to add the constant.
25 + 10 = 35
This matches the third term of given sequence. So, we will continue the addition to see if we get the other terms right too.
35 + 10 = 45
45 + 10 = 55
All the terms matches the given pattern.
The complete sequence will be 15, 25, 35, 45, 55
Therefore, the missing term is 55.
For such questions, we should know the basic operations. When the rule used to write the pattern is not mentioned, we have to use all four operations to check the pattern. The operations are addition, subtraction, division, and multiplication.
