Addition (0-9) | Second Grade Math Worksheets | Biglearners Worksheet: Second Grade. Addition Using 9. Children will practice addition with 9 from Monday to Thursday, then take a timed test on Friday. Category: ADDITION - 1 DIGIT Addition (0-9) Get this Worksheet. Worksheet: Second Grade. Counting on 1, 2 , and 3. Find each sum. Start with a greater number to count on.