Subitizing - recognizing the number of objects in a group without having to count the objects - is a fundamental building block for developing number sense. These simple 4-3/4" x 7-3/4" dot cards help students learn subitizing and understand the crucial concept of making 10 | Essential Learning Essential Products Subitizing Activity Cards, GR K-1, 4.75 x 7.75, 38 Double-Sided (ELP626633) | Quill.