tom bought 3 pieces of bubble gum for 12 cents total, if tom paid with a quarter how much change was left after the purchase

0.25 - 0.12 = ?

13 cents duh.

To find out how much change Tom received, we need to calculate the difference between the cost of the bubble gum and the amount he paid.

First, we need to find the cost of each piece of bubble gum. Since Tom bought 3 pieces for a total of 12 cents, we divide the total cost by the number of pieces:
Cost per piece = Total cost / Number of pieces = 12 cents / 3 pieces = 4 cents per piece.

Next, we calculate how much Tom paid in total by using the information that he used a quarter:
Amount paid by Tom = 25 cents.

To find the change, we subtract the amount paid from the total cost:
Change = Amount paid - Total cost = 25 cents - 12 cents = 13 cents.

Therefore, Tom received 13 cents as change after the purchase.