Playing With Numbers
If 31z5 is a multiple of 3, where z is a digit, what might be the values of z?
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Solve the cryptarithm: 4 x ABC=AB
does not have any solution.
Given that the number 7713a8
is divisible by 4, where a is a digit what are the possible values of ?
Express each of the following numbers as the sum of two odd primes:
36 (ii) 42 (iii) 84
Here are two different factor trees for 60. Write the missing numbers: (Figure)
Figure (ii) Figure
be a natural number such that the division n÷5
leaves a remainder of 4, and the division n÷2
leaves a remainder of 1. What must be the units digit of n
Find the LCM of 12 and 18
Find all the prime factors of 1729 and arrange them in ascending order. Now state the relation, if any; between two consecutive prime factors.
Determine the greatest 3-digit number exactly divisible by 8, 10 and 12. and 6 ,8 and 10