How can you write an expression that shows how to convert kilograms to grams by using k to stand for the number of kilograms

1 kilogram = 1000 grams

So to convert to grams, you need to multiply the number of kilogrammes, k, by 1000.

1000k

blue marble is 15 times out of 50 = 15/50 reduces to 3/10

landing on tails is 24 out of 50 = 24/50 reduces to 12/25

to find the probability of both multiply together:

3/10 x 12/25 = 3 x 12 / 10 x 25 = 36/250

if you multiplied the numerator and denominator by 10 you get 360/2500.

the answer is 360/2500