Sarah and Felipe were playing video games. Sarah scored 21,456 points, and Felipe scored 9,087 points. About how many points did Sarah and Felipe score altogether?

30,543

To find out how many points Sarah and Felipe scored altogether, you simply need to add up their individual scores.

Sarah's score: 21,456 points
Felipe's score: 9,087 points

To add these numbers together, you align the digits and add them up from right to left, just like you would do with regular addition.
Starting from the rightmost digits:
6+7=13 (write down 3, carry over 1)
5+8+1=14 (write down 4, carry over 1)
4+0+1=5

Therefore, Sarah and Felipe scored a total of 30,543 points altogether.

9+21 = 30

456 is about 500
87 is about 100
about 30 thousand six hundred
30,600