Playing With Numbers
is a multiple of 11, where z is a digit, what is the value of z
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Find the remainder when 981547 is divided by 5. Do this without doing actual division.
Which factors are not included in the prime factorisation of a composite number?
Solve the following cryptarithms:
is a digit such that the number 18x71
is divisible by 3. find possible values of x
Find numbers between 1 and 100 having exactly three factors.
Write First Five Multiples of:(a) 5 (b) 8 (c) 9
is a multiple of 6, where x is a digit, what is the value of x
Find the LCM of 20, 25 and 30