Here is an example of an IF and ELSE activity for grade 6:

Activity: Determining the Type of Triangle

Objective: To identify and classify different types of triangles based on their side lengths.

Instructions: 1. Divide the students into pairs or small groups. 2. Provide each group with a set of triangle cut-outs or drawings of triangles with different side lengths. 3. Instruct the students to measure the lengths of the sides of each triangle using a ruler or measuring tape. 4. Ask the students to write a program using IF and ELSE statements to determine the type of triangle based on its side lengths. 5. The program should include the following conditions: - IF all three sides are equal, print “Equilateral triangle.” - ELSE IF two sides are equal, print “Isosceles triangle.” - ELSE, print “Scalene triangle.” 6. Once the students have written their programs, they should test them by inputting the side lengths of each triangle and checking if the output matches the expected type of triangle. 7. Encourage the students to discuss and compare their results with other groups. 8. As an extension activity, challenge the students to modify their programs to also determine if the triangle is a right triangle (one angle measuring 90 degrees) based on the Pythagorean theorem.

Note: This activity can be done using programming languages like Python, Scratch, or any other language that supports IF and ELSE statements.