posted by RORO on .
A bike shop has 8 red, 5 blue, 12 black, and 9 white bikes. Write an expression that shows how many more black bikes than red bikes there are.
Let's see. You just said there are 12 black and 8 red.
How many more than 8 is 12?
For the "expression", write down what numbers you subtract to get the answer.