Hello! Hope everyones doing ok. could use your help here:

1. Draw 16 stairs. Put them equally into 2 sets. How many stairs are in each set? ___

2. Round each number to the nearest 10. Then subtract : 497 - 315 is about: ___

3. Abel drew some Triangles. his drawing had 21 Vertices. How many triangles did he draw? write a division equation to answer the question: ___