- 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.
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.
|I start by putting out one of the partial ten frames. I ask kids how many dots they see.|
|I place another full ten frame next to the first one and ask kids how many dots they see. Some kids will know immediately and others might need to count some or all of the collection.|
|Varying the start number will give your students more practice with these big ideas|
- How do you work on this important standard with YOUR students? Respond in the comments below!