6TH GRADE MATH WORKSHEET - onlinemath4all 6TH GRADE MATH WORKSHEET. Question 1 : The sum of (-12) and (5) is (A) 6 (B) 8 (C) -7. Solution. Question 2 : The perimeter of the equilateral triangle is 18.Find the length of each (A) 5 (B) 4 (C) 6 ... Comparing rates worksheet. Customary units worksheet. Metric units worksheet. Complementary and supplementary worksheet.