The model shows a bar divided into equal parts. Each unit represents a value.<br><br>&bull; From the model, the equal units build up step by step<br>&bull; (1) = 10 - the first unit<br>&bull; (2) = 10 + 10 = 20 - two units combined<br>&bull; (3) = 20 + 10 = 30 - three units combined<br><br>Final Answer: (1) = 10, (2) = 20, (3) = 30