This lesson introduces students gradually to using letters in mathematics. It starts by discussing “constants” and “terms” with examples of each to help the students.
B) Understand that an unknown can be represented by a letter.
S) Match expression and sentences.
G) Form expressions from sentences.
All sides are provided with animated answers.
There are several warm-up questions discussing how “3 lots of a” could be written. Then there are fifteen practice questions.
This is followed by several more white board questions focusing on what “x - 3” means etc.
There’s a nice match-up task next, to give the students some help determining which sentences mean which expressions.
A nice “correct the misconception” questions involving perimeter and algebraic.
Next, there are some “progress check” questions (again with solutions) to determine how well the students have understood the lesson.
Finally, there are a couple of applied questions involving perimeter and area of rectilinear shapes.
The presentation finishes with a “which objective did you achieve today?” slide.