Question

It takes 50 pennies to fill a roll . How many pennies are in 8 rolls

Answer 1

400 pennies in 8 rolls.

Explanation:

Basically what they are giving you is an algebraic expression that you have to write out and solve.

So, if 1 roll of pennies fills 50 pennies, then the start of the problem would look like this: 50 = 1. But, that can't say that 50 = 1. That would be wrong in this situation. So, we need to add a variable.

Now, for this equation we are going to use the variable r for roll(s).

So, now the equation would be 50r to start with. (The reason why I wrote it out like this is because the r represents how many rolls will be multiplied by the 50 to get your answer.)

Then, you fit the 8 into the problem. 50r (or 50 x 8) = 400 pennies.

So, in the end, there are 400 pennies in 8 rolls.

Hope this helps.