There are 40 coins in a roll of nickles. Find the value of 25 rolls of nickels.

well, we know a nickel is 5 cents, a dollar is 100 cents, how many times does 5 go into 100? 100 : 5 = 20, twenty times, so there are 20 nickels in 1 dollar.

these rolls each have 40 nickels though, namely 20 + 20 = 1 dollar + 1 dollar, so there are 2 dollars in one of these rolls.

we know there are 2 bucks in a roll of nickels, how many in 25 rolls? 25 * 2 = $50.

To get the answer you have to multiply the number of coins per roll which is 40 by the number of rolls which is 25. So the equation you get is 40*25. And the answer you get is 1000