Ontario math worksheets | OwlWorksheets.ca Currently, the Grades 1 and 2 worksheets are based on the 2020 Ontario Math curriculum and the Grades 3 worksheets are based on the 2005 Ontario math curriculum. Grade 3 will be updated by end of fall 2021. 2005 Math Strands Number Sense and Numeration Measurement Geometry and Spatial Sense Patterning and Algebra Data Management and Probability