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Practice 3 Properties of Numbers

1 Find x if 43x is divisible by 5.
2 Find x if 26x is divisible by 6.
3 List all factors of 63.
4 List the multiples of 6 which lie between 30 and 50.
5 If an even number is multiplicd by an odd nunber. and then an odd number is subtracted from the result, is the final answer odd or even?
6 List the prime numbers between 40 and 50.
7 Write 2 x 3 x 5 as a natural number.
8 Determine the LCM of 6 and 8.
9 Write 420 as the product of its prime factors in index form.
10 Find the largest number which divides exactly into both 63 and 84.
11 I am a two digit number. I am a multiple of 8. Both my digits are prime numbers.
Which number am 1?
12 Write down the 21st odd number.
13 Find the smallest multiple of 11 which is greater than 300.
14 What is the minimum number of sweets needed if they are to be shared exactly between either 5, 6 or 9 children?