Take a visit to an educational supply store... there are a lot of tangible math games for very young kids. One that works well at very young ages is a physical

Take a visit to an educational supply store... there are a lot of tangible math games for very young kids. One that works well at very young ages is a physical balancing game. You get a balance and a variety of tokens (some that look like blocks or small animals, etc.) and some that look like actual numerals. The numerals have the same weight as the same number of tokens. So kids can put the number 3 on one side of the balance and then learn that they have to stack 3 tokens on the other side to make the balance balance. You can also ask questions, e.g., you can place the number 3 on one side of the balance and then one token on the other side and ask them to predict how many tokens need to be added to that one token to add to the number on the other side. And you can make it progressively more complex, e.g., stack the number 3 and number 2 on one side of the balance and then let kids figure out how many individual tokens need to be stacked on the other side to amount to the sum of 3 and 2. The pivoting action of the balance tends to keep kids' attention (but be realistic about the attention spans of young kids... we're talking under 15 minutes a session).