Add and subtract expressions with letters

Answer Key - Grade 7 Math Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   The math bell rings, and Milo grabs the puzzle. How would Milo write (4x − 5) + (2x + 3) with as few terms as possible?

   6x − 2
2. 2.

   Pia wears a crown for the puzzle of the day. How would Pia write (5x + 2) + (-3x − 6) with as few terms as possible?

   2x − 4
3. 3.

   Tala finds a puzzle in the mailbox, folded in three. How would Tala write (3x − 4) − (x − 6) with as few terms as possible?

   2x + 2
4. 4.

   It rains, so Ari does the puzzle under an umbrella. How would Ari write (4x − 1) − (-2x + 6) with as few terms as possible?

   6x − 7
5. 5.

   Bo solves a puzzle in the sun. Bo must subtract (2x − 3) from (7x + 1). What is the result, with as few terms as possible?

   5x + 4
6. 6.

   Esme turns on a lamp for the late puzzle. Esme must subtract (x + 5) from (4x − 2). What is the result, with as few terms as possible?

   3x − 7
7. 7.

   Jun reads a puzzle painted on a castle wall. Jun must subtract (3x − 2) from (-x + 8). What is the result, with as few terms as possible?

   -4x + 10
8. 8.

   Kira reads a puzzle by flashlight in a tent. Which expression is equal to (5x + 4) − (2x − 3)?

   • 7x + 1
   • 10x
   • 3x + 1
   • 3x + 7
9. 9.

   Luz solves a puzzle on the bus, bumps and all. Which expression is equal to (7x − 2) − (3x + 5)?

   • -3x
   • 4x + 3
   • 4x − 7
   • 10x + 3
10. 10.

    Each star scores x points; each puddle costs 1 point. Round 1: 6 stars, 2 puddles. Round 2: 3 stars, 4 puddles. What is Pia's total, with as few terms as possible?

    9x − 6