What does 더하기 look like on Google?

On Google it is the design shipped in 17.0, shown above at full size. Older revisions are listed beneath it.

When did Google add 더하기?

Google first drew 더하기 in Android 4.3, released 2013년 7월 24일.

Google LLC has shipped 21 versions of 더하기. Each is dated, so you can see when the design changed.

Google Android 9.0

This is the design Google introduced in Android 8.0, shipped again unchanged. It was not redrawn for this release.

✳ marks a release that redrew this emoji. The rest re-shipped the design unchanged.

What does 더하기 look like on Google?: On Google it is the design shipped in 17.0, shown above at full size. Older revisions are listed beneath it.
When did Google add 더하기?: Google first drew 더하기 in Android 4.3, released 2013년 7월 24일.
How many times has Google redrawn 더하기?: Google LLC has shipped 21 versions of 더하기. Each is dated, so you can see when the design changed.