S3kEjXPj
https://rocdata.global/USA/standardnodes/S3kEjXPj
https://rocdata.global/USA
https://rocdata.global/USA/documents/DayhBeyn
https://rocdata.global/USA/standardnodes/SWeXDmzj
2.0
CCSS.Math.Content.1.NBT.C.5
Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
67
2020-12-17T17:26:55.168156Z
2020-12-17T17:26:55.168199Z
4