
In the Common Core Standards for first grade there is this little standard about students being able to find 10 more or 10 less than any two-digit number.
- 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.
I find this standard an important one to make sure first graders can do. It forms the foundation for important work thinking about adding and subtracting two digit numbers later in grade 1 and into second grade. The
strategies and ideas kids share when adding or subtracting two and three digit numbers start with making sure your students master this important standard.
Here is a quick and easy routine I do with mini ten frames to ensure students have this important standard down. The ten frames I use in this activity are available as free downloads
here and
here. The first link takes you to a sheet of full mini ten frames and the second to a sheet of partial mini ten frames. I use one vertical strip from each sheet for each kid. This gives them each a 1-9 mini ten frame and 10 full mini ten frames.
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