Class 8

Math

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Playing With Numbers

If $31z$ 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: (i) $ABx6\BBB$

If $x$ 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

If $24x$ is a multiple of 6, where x is a digit, what is the value of $x$ ?

Find the LCM of 20, 25 and 30