54+21 break up both numbers
To break up the numbers 54 and 21, you can separate each number into its individual digits. Let's do that:
For 54:
5 + 4
For 21:
2 + 1
Now we can add the separate digits together:
5 + 4 = 9
2 + 1 = 3
Finally, we can add the results together:
9 + 3 = 12
So, 54 + 21 equals 12.