Seven plus 84 equals what.
To help us calculate the answer, we could partition number 84, by breaking the number apart into its tens and ones. The eight digit in number 84 is worth eight tens. Eight tens are 80. And the four is worth four ones, which is four. So we can partition 84 into 80 and four. Now, we can add seven and 80 and four. First, we can add the ones. Seven plus four equals 11. Now, we can add this to the 80. 11 plus 80 equals 91.
84 plus seven equals 91.