This Algebra Equations (set 1) Worksheet is perfect to practice algebra skills. Your elementary grade students will love this Algebra Equations (set 1) Worksheet. x + 3 = 13, x = ?. Answers up to 10; 5 pages; 15 problems per page. Common Core_Math_6.EE.A.1, 6.EE.A.2, 6.EE.A.3,