Free 2nd Grade Math Worksheets - Homeschool Math 100 chart, every 2nd number colored; Skip-count by 10s till 1000, every 50th number colored. Rounding is not required for 2nd grade in the Common Core standards in the US; however I provide these links in case rounding is studied in 2nd grade in your country/curriculum. Round numbers to the nearest ten within 0-100