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8th Grade Math (Math 8) · Chapter 6 · Lesson 6.5 · Printable PDF

Evaluating a Function at a Number Worksheet with Answer Key

6 problems on evaluating a function at a number: finding values, comparing two students' work on a negative input, finding a lost coefficient, solving for inputs, soil in flower pots, and a growing sapling. 2 pages, with a worked answer key.

6 problems2 pagesanswer key
Printable Evaluating a function at a number worksheet with answer key - 8th Grade Math (Math 8) (Page 1 PDF preview)
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Try one first: a free Chapter 1 worksheet (PDF, no sign-in).

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What's on the worksheet

  1. Find each value of the functions f and g:
    f(4)f(-3)f\left(\dfrac{1}{2}\right)g(-6)g(5)
  2. Decide which of Maya's and Omar's work on h(-4) is right.
  3. Find the lost number a in a function from one known value, then evaluate.
  4. Find every input with a given output, and the output with only one input.
  5. Word problem: the potting soil left after Sofia fills n pots.
  6. Word problem: the height of Hannah's sapling after m months.

Teach it first

The free lesson teaches it with worked examples and practice problems.

Evaluating a function at a number: the lesson ›

More Chapter 6 worksheets: Functions