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Divide with an Area Model is a free printable Grade 4 math worksheet on finding a missing side by splitting the area into two parts, aligned to Common Core standard 4.NBT.B.6. 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 5 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.

Divide with an Area Model

4.NBT.B.6

NameDate

Read carefully, then work out the answer.

1.A rectangle has an area of 48 square units. One side is 4 units long. Split the area into 40 and 8. How long is the other side?
Answer:
2.A rectangle has an area of 100 square units. One side is 4 units long. Split the area into 80 and 20. How long is the other side?
Answer:
3.A rectangle has an area of 171 square units. One side is 3 units long. Split the area into 150 and 21. How long is the other side?
Answer:
4.A rectangle has an area of 117 square units. One side is 9 units long. Split the area into 90 and 27. How long is the other side?
Answer:
5.A rectangle has an area of 355 square units. One side is 5 units long. Split the area into 350 and 5. How long is the other side?
Answer:
6.A rectangle has an area of 288 square units. One side is 8 units long. Split the area into 240 and 48. How long is the other side?
Answer:

LessonPrint · 4.NBT.B.6 · Set 5 · free to copy for classroom use

Answer key — Divide with an Area Model

Set 5. Prints on its own sheet.

  1. 1.40 ÷ 4 = 10; 8 ÷ 4 = 2; 10 + 2 = 12 units
  2. 2.80 ÷ 4 = 20; 20 ÷ 4 = 5; 20 + 5 = 25 units
  3. 3.150 ÷ 3 = 50; 21 ÷ 3 = 7; 50 + 7 = 57 units
  4. 4.90 ÷ 9 = 10; 27 ÷ 9 = 3; 10 + 3 = 13 units
  5. 5.350 ÷ 5 = 70; 5 ÷ 5 = 1; 70 + 1 = 71 units
  6. 6.240 ÷ 8 = 30; 48 ÷ 8 = 6; 30 + 6 = 36 units

Last reviewed 2026-09-05. Aligned to 4.NBT.B.6 of the Common Core State Standards for Mathematics.