Question. Lara is baking cookies using four baking trays. She places five rows of cookies on a baking tray where there are six cookies in one row. How many cookies is she baking?
Answer. 120
What step-by-step reasoning justifies that answer?
Reasoning: Lara can bake 5 x 6 = 30 cookies in one tray. So, Lara is baking a total of 30 x 4 = 120 cookies.