Mathematics
Grade-1
Easy
Question
Complete the series of numbers:
80, ____, ____
- 60 - 70
- 90, 100
- 30 - 40
- 20 - 40
Hint:
In a given series, the difference of any two consecutive numbers or terms is the same and positive.
The correct answer is: 90, 100
Here, we are to find the missing terms of the series.
A) Putting 20 and -40, we get
20-80=-60.
and, -40-20=-60.
Here, the difference is the same.
B) Putting 60 and -70, we get
60-80=-20.
and -70-60=-130.
Here, the difference is not same.
C)Putting 30 and -40, we get
30-80=-50
and, -40-30=-70.
Here, the difference is not same.
D) Putting 90 and 100, we get
90-80=10
and, 100-90=10.
Here, the difference is same and positive.
Hence, the correct option is D.
The next term of the series can calculated by adding the common difference.
