Try before you buy! This free sample includes 1 complete worksheet from our Grade 1 Addition Within 10 pack — 16 problems including computation, word problems, and a bonus challenge, plus a full answer key. Love it? Get the full 5-worksheet pack with 80 problems! Search "Aqidium Education" for all our packs. Search terms: 1st grade math worksheets, addition within 10, free addition sample, answer key, sums to 10, printable math practice PDF.