The sum of two consecutive odd numbers is divisible by 4. Verify this statement with the help of some examples.

I am the smallest number , having four ifferent prime factors. can you find me?

Express each of the following numbers as the sum of three odd primes:

(a) 21 (b) 31 (c) 53 (d) 61

Find the largest number which divides 2011 and 2623 leaving remainders 9 and 5 respectively. Please answer fast because tommorow's exam!!!

 find the smallest number which when divided by 25,40,60, leaves remainder 7 in each case .

Find the smallest number which when divided by 18,12,24 leaves a remainder of 16,10 and 22 respectively

Write the smallest 5-digit number and express it in the form of its prime factors.

1. find the least digit no which leaves remainder 3 in each case when divided by 5,10,12,15,18,25,30.
2. find the least natural no which when divided by 989and 1892 leaves a remainder 1.
3. find the greast 4-digit novwhich when divided by 36,30,24and 16 leaves a remainder 13 in each case

lcm of pair of numbers is 4 and their sum is 6 what are the numbers

The traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 108 seconds respectively. If they change simultaneously at 7 a.m., at what time will they change simultaneously again?

Write five pairs of prime numbers less than 20 whose sum is divisible by 5.

(Hint: 3 + 7 = 10)