3.NBT.A.1 math practice. Learn by doing.

The digit one place to the right is $8$, so round up: $287 \to 300$.

The digit one place to the right is $4$, so round down: $984 \to 980$.

The digit one place to the right is $6$, so round up: $862 \to 900$.

The digit one place to the right is $5$, so round up: $905 \to 910$.

The digit one place to the right is $2$, so round down: $44{,}024 \to 44{,}000$.

The digit one place to the right is $7$, so round up: $617 \to 620$.

The digit one place to the right is $4$, so round down: $1{,}445 \to 1{,}400$.

The digit one place to the right is $1$, so round down: $3{,}551 \to 3{,}550$.