Basic 6Mathematics18 min

Expression Cards and Substitution

Learners use perimeter expressions and substitution.

Evaluate algebraic expressions by substituting values.

Learners design a rectangular classroom display and use expressions to calculate perimeter for different side lengths.

Expression Cards and Substitution illustration

Learners use perimeter expressions and substitution.

Evaluate 2l + 2w when l = 8 and w = 5.

  1. Substitute the values into the expression: 2(8) + 2(5).
  2. Calculate 16 + 10 = 26, so the perimeter is 26 units.