Add a multiple of 10 to 3 digits (timed)
Add a multiple of 10 to a 3-digit number, crossing 100.
Add a multiple of 10 to 3 digits (timed)
Add a multiple of 10 to a 3-digit number, crossing 100.
Add a multiple of 10 to a 3-digit number, crossing 100.
Add a multiple of 10 to a 3-digit number, crossing 100.
