Find the factors of 60 that are prime numbers

Find the lowest common multiple of 12 and 15.

At 9 p.m the temperature in Washington was -2 degree celcius. During the night, the temperature went down 5 degrees. So what was the temperature at midnight in Washington?

Find the lowest common multiple of 6 and 9

In the following numbers, which are prime numbers? 1, 3, 2, 8, 16, 17

Find the common factors of 18 and 27

In early morning, the temperature in Washington was -2 degree celcius. During the day, the temperature went up 10 degree celcius. What was the temperature at midday in Washington?

In the following numbers, which are common multiples of both 6 and 7? 13, 14, 24, 28, 42, 69.

What are multiple of 15 which are less than 100?

What are factors of 18?