Simple Arithmetic & Mental Ability
Simple Arithmetic and Mental ability is about model questions that you can expect for competitive examinations. Here you can find out practice problems in Maths GK.
SIMPLE ARITHMETIC & MENTAL ABILITY
Maths Questions for Competitive Examinations/ GK Maths.
Choose the correct answer from the options given below:
- Find the sum of first 18 terms of the AP 10, 15, 20, 25………
A. 745
B. 845
C. 945 - Find the odd one out:
A. Rectangle
B. Triangle
C. Pentagon - 5000 rupees is invested at the rate of 12 rupees p.a. for 2 years. Find simple interest?
A. 1000
B. 1100
C. 1200 - Find the distance between -3 and +3 on a number line?
A. 3
B. 6
C. 4 - Find the sum of the reciprocals of all factors of 10?
A. 1.8
B. 18
C. 0.18 - Write the next number: 6, 10, 16, 26, 42, ——–
A. 46
B. 54
C. 68 - Find the value of 32.91 + 30.09 + 0.50 + 5?
A. 68.50
B. 64.50
C. 62.55 - Find the value of 11 x 3 – 22 + 11 – 2 x 11?
A. 0
B. 11
C. 22 - Find the odd one out:
A. 351
B. 405
C. 542 - Find the sum of first 20 natural numbers?
A. 200
B. 210
C. 220
Answers with Explanation:
- 945
- Triangle
- 1200
- 6
- 1.8
- 68
- 68.50
- 0
- 542
- 210
Explanations:
- Here a = 10, d = 5, n = 18
Sum of n terms = n/2 [2a + (n – 1) d]
Sum of 18 terms = 18/2 [2 x 10 + (18 – 1) 5]
= 9[20 + 17 x 5]
= 9 x 105
= 945 - Diagonals are not possible in the case of triangles. In rectangle and pentagon, we can draw diagonals.
- Simple Interest I = PRT/100
= 5000 x 12 x 2 /100
= 50 x 24
= 1200 - 3 – (-3) = 3 + 3 = 6
- Factors of 10 are 1, 2, 5 and 10
Sum of its reciprocals = 1 + ½ + 1/5 + 1/10
= (10 + 5 + 2 + 1)/10
= 18/10
= 1.8 - 6 + 10 = 16
16 + 10 = 26
26 + 16 = 42
42 + 26 = 68 - 68.50
- 11 x 3 – 22 + 11 – 2 x 11 = 33 – 22 + 11 – 22 = 0
- Other two number’s sum of the digits is 9.
- n (n + 1)/2 = 20 (20 + 1) /2 = (20 x 21)/2 = 210.