What DID We Do All Day? has a great outdoor math activity for preschoolers – numbers and pinecone counters. It’s a unique variation of Montessori cards and counters 1-10 and a fun way to review math skills in the summer.
The only essential materials are sidewalk chalk to write the numerals and pine cones (rocks or other natural objects could be used instead) for the counters. You could add a second color of chalk if you want your child to trace over the numerals you write.
What is especially fun is the idea from What DID We Do All Day? to have your child use a toy dump truck to haul the pine cones needed for the activity. My son would have loved that when he was younger. My daughter wouldn’t have been excited about the dump truck, but she would have loved tracing or writing numerals with chalk and placing the correct number of pine cones below each numeral.
Note: Montessori cards and counters give children a visual impression of odd and even. Two counters are placed in each row with the leftover counter in the center of the bottom row.