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Write an Equation with a Letter is a free printable Grade 4 math worksheet on turning a two-step story into one equation with n for the unknown, aligned to Common Core standard 4.OA.A.3. It prints 6 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 23 of 25 · the same problems every time you open this link.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Write an Equation with a Letter

4.OA.A.3

NameDate

Write an equation using n, then solve it.

1.Dilan buys 7 packs of marbles with 15 in each and gives 10 to Mei. Write an equation with n for how many are left, then solve it.
Answer:
2.Priya buys 5 packs of marbles with 8 in each and finds 7 more. Write an equation with n for the total, then solve it.
Answer:
3.Noor buys 9 packs of erasers with 10 in each and finds 15 more. Write an equation with n for the total, then solve it.
Answer:
4.Tomas buys 5 packs of beads with 10 in each and gives 5 to Freya. Write an equation with n for how many are left, then solve it.
Answer:
5.Mei buys 4 packs of cards with 11 in each and gives 19 to Luis. Write an equation with n for how many are left, then solve it.
Answer:
6.Luis buys 3 packs of shells with 9 in each and finds 20 more. Write an equation with n for the total, then solve it.
Answer:

LessonPrint · 4.OA.A.3 · Set 23 · free to copy for classroom use

Answer key — Write an Equation with a Letter

Set 23. Prints on its own sheet.

  1. 1.n = 7 × 15 − 10; n = 95
  2. 2.n = 5 × 8 + 7; n = 47
  3. 3.n = 9 × 10 + 15; n = 105
  4. 4.n = 5 × 10 − 5; n = 45
  5. 5.n = 4 × 11 − 19; n = 25
  6. 6.n = 3 × 9 + 20; n = 47

Last reviewed 2026-09-05. Aligned to 4.OA.A.3 of the Common Core State Standards for Mathematics.