To find out how much longer a 1-inch button is than a 3/8-inch button, we need to subtract the length of the 3/8-inch button from the length of the 1-inch button:
1 inch - 3/8 inch
To subtract these two lengths, we need to express them using a common denominator. The smallest common denominator of 8 and 1 is 8, so we can rewrite the lengths as:
1 inch = 8/8 inches
3/8 inch = 3/8 inches
Now we can subtract:
8/8 inches - 3/8 inches = 5/8 inches
Therefore, a 1-inch button is 5/8 inches longer than a 3/8-inch button.