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Prepare your child for IMO, ISO, IEO, ICSO, IGKO & ISSO with olympiad-level practice.
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Mock tests closest to the actual exam
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Playing With Numbers (Mathematics) Class 8 - NCERT Questions
Q 1.
Find the values of the letters in each of the following and give reasons for the steps involved.
SOLUTION:
Q 2.
Find the values of the letters in each of the following and give reasons for the steps involved.
SOLUTION:
Q 3.
Find the values of the letters in each of the following and give reasons for the steps involved.
SOLUTION:
Q 4.
Find the values of the letters in each of the following and give reasons for the steps involved.
SOLUTION:
Q 5.
Find the values of the letters in each of the following and give reasons for the steps involved.
SOLUTION:
Q 6.
Find the values of the letters in each of the following and give reasons for the steps involved.
SOLUTION:
Q 7.
Find the values of the letters in each of the following and give reasons for the steps involved.
SOLUTION:
Q 8.
Find the values of the letters in each of the following and give reasons for the steps involved.
SOLUTION:
Q 9.
Find the values of the letters in each of the following and give reasons for the steps involved.
SOLUTION:
Q 10.
Find the values of the letters in each of the following and give reasons for the steps involved.
SOLUTION:
Q 11.
If 21y5 is a multiple of 9, where y is a digit, what is the value of y?
SOLUTION:
Q 12.
If 31z5 is a multiple of 9, where z is a digit, what is the value of z? You will find that there are two answers for the last problem. Why is this so?
SOLUTION:
Q 13.
If 24x is a multiple of 3, where x is a digit, what is the value of x?
(Since 24x is a multiple of 3, its sum of digits 6 + x is a multiple of 3; so 6 + x is one of these numbers : 0, 3, 6, 9, 12, 15, 18, ........ . But since x is a digit, it can only be that 6 + x = 6 or 9 or 12 or 15. Therefore, x = 0 or 3 or 6 or 9. Thus, x can have any of four different values).
SOLUTION:
Q 14.
If 31z5 is a multiple of 3, where z is a digit, what might be the values of z?
