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Find the Missing Side is a free printable Grade 4 maths worksheet on working backwards from an area, aligned to Common Core standard 4.MD.A.3. It prints 8 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 19 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.

Find the Missing Side

4.MD.A.3

NameDate

Work out the missing side.

1.
Area is 32, one side is 4. Other side =
2.
Area is 48, one side is 4. Other side =
3.
Area is 55, one side is 5. Other side =
4.
Area is 40, one side is 5. Other side =
5.
Area is 63, one side is 7. Other side =
6.
Area is 48, one side is 6. Other side =
7.
Area is 50, one side is 5. Other side =
8.
Area is 66, one side is 6. Other side =

LessonPrint · 4.MD.A.3 · Set 19 · free to copy for classroom use

Answer key — Find the Missing Side

Set 19. Prints on its own sheet.

  1. 1.8
  2. 2.12
  3. 3.11
  4. 4.8
  5. 5.9
  6. 6.8
  7. 7.10
  8. 8.11

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