CBSE Class 7 Mathematics Number Play MCQs Set 10

Question. In the cryptarithm T + T + T = UT, the single digit T must be what number?
(a) 1
(b) 5
(c) 2
(d) 8

Answer: B

Question. If T = 5 in the cryptarithm T + T + T = UT, then UT = 15. The digit U must be what number?
(a) 1
(b) 5
(c) 0
(d) 2

Answer: A

Question. What is the digit sum of 378?
(a) 16
(b) 18
(c) 12
(d) 17

Answer: B

Question. In the cryptarithm K2 + K2 = HMM, M must correspond to what digit, because 2+2=4?
(a) 2
(b) 4
(c) 8
(d) 0

Answer: B

Question. Cryptarithms are what types of questions?
(a) Word problems
(b) Algebraic equations
(c) Digits in disguise problems
(d) Parity problems

Answer: C

Question. Dorjee's light bulb is ON. If he toggles the switch an odd number of times (like 77), the final state of the bulb will be what?
(a) ON
(b) OFF
(c) Flickering
(d) Cannot tell

Answer: B

Question. Which of the following numbers is divisible by 10?
(a) 100
(b) 105
(c) 111
(d) 125

Answer: A

Question. If the light bulb starts OFF and is toggled an even number of times, the final state is what?
(a) ON
(b) OFF
(c) Sometimes ON, sometimes OFF
(d) Cannot find

Answer: B

Question. Liswini had 50 loose sheets (100 pages total). The sum of all page numbers was 6000. Is this possible, based on parity rules?
(a) No, because 100 pages must result in an odd sum.
(b) Yes, because the sum of 50 odd numbers (odd pages) and 50 even numbers (even pages) results in an even total.
(c) No, because 50 is an odd number of sheets.
(d) Yes, because 6000 is a big number.

Answer: B

Question. Why must the total money Lakpa calculated (odd ₹1 + odd ₹5 + even ₹10) be an even number, not ₹205?
(a) Odd count of ₹1 is Odd value; Odd count of ₹5 is Odd value; Odd + Odd = Even value.
(b) The ₹10 coins make the total odd.
(c) ₹205 is a prime number.
(d) Odd + Odd + Even = Odd.

Answer: A

Question. What is the parity of the sum of 2 even numbers and 2 odd numbers?
(a) Odd
(b) Even
(c) Prime
(d) Cannot tell

Answer: B

Question. Which of these is divisible by 3 but not 2?
(a) 30
(b) 36
(c) 33
(d) 42

Answer: C

Question. What is the parity of the sum of 5 even numbers?
(a) Odd
(b) Even
(c) Always 5
(d) Always 0

Answer: B

Question. What is the parity of the sum of 8 odd numbers?
(a) Odd
(b) Even
(c) Always 8
(d) Always 1

Answer: B

Question. If you subtract an even number from an odd number (Odd - Even), the resulting parity is what?
(a) Even.
(b) Odd.
(c) Zero.
(d) Cannot tell.

Answer: B

Question. If you subtract an odd number from an even number (Even - Odd), the resulting parity is what?
(a) Even.
(b) Odd.
(c) Zero.
(d) Always 10.

Answer: B

Question. For a grid with dimensions 27 x 13, the total number of small squares will have what parity?
(a) Even.
(b) Odd.
(c) Always 27.
(d) Always 13.

Answer: B

Question. Which number is divisible by both 2 and 5?
(a) 20
(b) 35
(c) 60
(d) 45

Answer: A

Question. For a grid with dimensions 42 x 78, the total number of small squares will have what parity?
(a) Odd.
(b) Even.
(c) Always 42.
(d) Always 78.

Answer: B

Question. If a grid has dimensions m x n, and both m and n are odd numbers, the total number of small squares will have what parity?
(a) Always Even.
(b) Always Odd.
(c) Sometimes Even.
(d) Cannot find.

Answer: B