Add a two-digit and a one-digit number - without regrouping

What you'll learn

• Identify, with 80% accuracy, graphs that represent proportional relationships from a set of at least five different graphs by recognizing a straight line through the origin.
• Explain, in writing, why a given graph (either a straight line not through the origin or a curved line) does not represent a proportional relationship, using the terms 'constant of proportionality' and 'origin'.
• Determine, given a graph of a proportional relationship, the constant of proportionality (k) and express it as the slope (rise over run) of the line.
• Given a real-world scenario, create a graph that accurately represents a proportional relationship described in the scenario, ensuring the graph is linear, passes through the origin, and is labeled appropriately with 85% accuracy as determined by a checklist.