Groups of 10
We got out the beans to add to Acorn's Sensory Box and Froggy wanted to see who could hold more. Her estimating skills are great and she knew who had more each time at a glance. But counting them was a challenge until I reminded her about our groups of ten. When she made the piles into groups of 10, she easily counted both groups quickly.
When we went back to her math book after this activity, her addition improved. As adults, we instinctively work in base 10 and group automatically. I know once Froggy is comfortable with this and does it more naturally all math will be easier for her.