2.OA.C.3 math practice. Learn by doing.

The next even number after $1$ is $2$.

Next odd is $51$.

The ones digit of $28$ is $8$. The ones digits $0\textsf{,}$ $2\textsf{,}$ $4\textsf{,}$ $6\textsf{,}$ and $8$ mean the number is even, so $28$ is even.

The ones digit of $15$ is $5$. The ones digits $1\textsf{,}$ $3\textsf{,}$ $5\textsf{,}$ $7\textsf{,}$ and $9$ mean the number is odd, so $15$ is odd.

The next even number after $3$ is $4$.

The next odd number after $2$ is $3$.

The next even number after $7$ is $8$.

The next odd number after $6$ is $7$.