Adding fractions with common denominators is very easy. Once kids recognize that the condition is same denominators to add two or more fractions, the task is very straight forward.
When two or more fractions have the same Denominators, just add their Numerators to get the Numerator of the answer and common denominator stays the same for the answer.
Following are the activity sheets to practice the concept;
https://steemitimages.com/0x0/https://ipfs.busy.org/ipfs/QmTd4Nm4BmxHLbTtfjzdhyCxMqbH5AdFqUuBtuUH6KuFLo