- Counting: The third-grade child may have counted how many toys or objects the 1-year-old brother was playing with.
- Sorting: The third-grade child may have sorted toys or objects by size or color for the 1-year-old brother to play with.
- Patterns: The third-grade child may have created patterns with toys or objects for the 1-year-old brother to mimic.
- Shapes: The third-grade child may have pointed out shapes of toys or objects to the 1-year-old brother.
- Measurement: The third-grade child may have measured the height or length of toys or objects for the 1-year-old brother to understand.
For continued development, the third-grade child can continue to play with their younger sibling and incorporate more math concepts such as addition and subtraction by counting how many toys they have together and taking some away or adding more. They can also introduce concepts such as time by setting a timer for how long they play together or using a clock to tell time. Additionally, they can explore more complex shapes and patterns with toys or objects and even create their own games that involve math concepts.