Woksheet: Logical Reasoning | Mental Mathematics for Class 8 PDF Download

Q1:
(a) 6
(b) 3
(c) 12
(d) 33333

Q2: P(x) is a polynomial such that  If P(9) = 344, Find the value of P(21).
(a) 344
(b) 348
(c)
(d)

Q3:  Tina introduces Rajesh as the son of the brother of her mother. How is Tina related to Rajesh?
(a) Cousin
(b) Nephew
(c) Aunt
(d) Daughter

Q4: If we use (x+) to indicate the following sum: 1 + 2 + 3 + ... + x then the value of k in the following equation is  ______ .
(21+) - (20+) = (k+).

Q5: During a day, the hour hand and the minute hand of a clock form a right angle, at multiple times. For example, the two hands form a right angle at 9 am. How many times during a day (24 hours) will the two hands form a right angle?

Q6: How many more squares need to be shaded to cover 75% of the total area?

(a) 6
(b) 42
(c) 24
(d) 48

Q7: What is the missing number in the series: 1, 2, 4, 3, 9, 4, 16, __25, 6, 36, 7 ?
(a) 5
(b) 4
(c) 25
(d) 6

Q8: If we use (x+) to indicate the following sum:  1 + 2 + 3 + ... + x then find the value of k in the following equation: (15+) - (14+) = (k+).
(a) 6
(b) 7
(c) 5
(d) 3

Q9: If N = 11111², find the 5^th digit in the expansion of N from the right.

Q10: Ashish likes 144 but not 134, 1600 but not 1700, and 5625 but not 5610. Which of the following four numbers would he like: 629, 618, 625 or 622?