Ten frame dot cards are a great resource to use when subitizing. Subitizing is the ability to quickly identify the total amount in a group without counting one-to-one. Using dots in ten frames when working on subitizing is powerful because students will soon know that the total amount cannot exceed ten. I use these for math warm-up before we do whole group instruction. I also put these in a math bin during Guided Math or math stations once students understand how to use them appropriately. I will hold up a card for three seconds and put it down. Students show me a thumbs up if they know the total amount or thumb sideways if they are not sure. I hold up the same card for three more seconds and put it down again. Students, again, show me a thumbs up or sideways. I have students with thumbs up share how they subitized. Students share groupings that they saw to help them count on to figure out the total amount. Subitizing not only helps students figure out the total amount quickly, but helps them realize and see that different groupings can total the same amount!
These ten frame dot cards are very ENGAGING for students because it allows them to discover the total amount by seeing different groupings of dots all within a ten frame!
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~The Brain Train~