Adding fractions

Teacher:  “We’re going to try adding fractions; for instance 2 5 + 1 15 https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315563688/17275003-2460-4424-8f87-3ffde62fbed0/content/eqn3_1.tif"/> .”