Multiplying Monomials and Polynomials (move to higher grades when possible)
Algebra, and more...

 1 EASY $$2x \times 4y =$$

 2 EASY $$7r \times 5r =$$

 3 MEDIUM $$2x^2 \times 4x^4 =$$ $$8x^6$$$$8x^8$$$$6x^6$$$$6x^8$$Already simplified

 4 MEDIUM $$(7r + 3r) \times 12c =$$ $$120rc$$$$120cr$$Both of the above$$72rc + 36cr$$None of the above

 5 HARD $$9w \times (10t + 4n) =$$ $$90w + 90t + 36w + 36n$$$$90wt + 36wn$$$$126wtn$$$$126ntw$$None of the above

 6 HARD $$(7t + 4t) \times (11q-5n) =$$ $$121tq - 55tn$$$$121t + 55tn$$$$55tn - 121tq$$$$77tq - 20tn$$None of the above