Hi Catheryn,
Thank you for the great question regarding Miquon. It would be possible to begin Miquon in first grade with a child who already knows some addition, subtraction and even a bit of multiplication. Miquon is known for introducing a variety of concepts in each book, it may still be necessary to begin with the Orange book to ensure there are no gaps in the math sequencing. I have attached the PDF Scope and Sequence for Miquon Math so you can easily see the concepts taught in each level. Please let us know if you have other questions.
Deanne
