Mississippi Math F-BF.1a
The Standard
- F-BF.1
- Write a function that describes a relationship between two quantities.
Determine an explicit expression or steps for calculation from a context.
2025 Mississippi College- and Career-Readiness Standards for Mathematics · Build a Function that Models a Relationship Between Two Quantities
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students name the input and output in a situation, then write a rule to calculate the output. They check the rule with a value from the situation.
What Mastery Looks Like
- For a tank that starts with 20 liters and gains 3 liters each minute, a student writes V(m) = 20 + 3m. They find 35 liters after 5 minutes and explain why only the 3 is multiplied by m.
Common Misconceptions
- Students may multiply a starting amount by the input or add a per-unit charge only once. They may keep using one rate after the situation says the price changes.
How to Assess It
- Exit ticket: A bike rental costs $6 plus $4 per hour. Write a rule for the cost after h hours, say what h means, and find the cost for 3 hours.
Lesson moves
Ways to Teach It
Give pairs square tiles to build 2-by-2, 3-by-3, and 4-by-4 patios, then write a rule for an n-by-n patio.
Ask: A gym charges $12 to join and $5 per visit. Why does 12 + 5v work, but 12v + 5 does not?
Give groups cards with stories, tables, and formulas; have them match each set and check the rule with an input of 4.
Show a parking sign: $5 for the first hour, $2 for each later hour. Write steps to price any whole-hour stay.
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Printable F-BF.1a Worksheet
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