Was helping my younger sister out with hw when we got stumped on this.

Teacher was adamant with giving a precise answer he even gave us very little room to write down the answer on the home work sheet.

My sister even tried setting up an addition table but we ran into huge problems when trying to line up all the digits we even tried adding from the left side first but we were unsuccessful when we started moving past the decimal

Im thinking about just going for half credit by stating if the sum would be a rational or irrational number but thats looking to be even harder than the original problem.

can /sci/ solve this elementary school level hw problem?