1st Grade Math Addition Educational Worksheets K-2 Math Printable Educational Worksheets - 10 Frame - #1. These worksheets are perfect for homeschooling lessons or extra math practice. Lessons focus 10 frame activities. Can also be used for advances Preschool level students or as a scaffolding activity in 1st Grade. Included: Worksheets in PDF format sized at 8.5 x 11.