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Cut-Out Corners is a free printable Grade 3 math worksheet on finding an area by taking a missing rectangle away from a whole one, aligned to Common Core standard 3.MD.C.7. 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 9 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.

Cut-Out Corners

3.MD.C.7

NameDate

Work out each area.

1.A rectangular piece of carpet is 10 feet by 5 feet. A rectangle 2 feet by 2 feet is cut out of one corner. What area is left?
Answer:
2.A rectangular sheet of cardboard is 8 meters by 5 meters. A rectangle 4 meters by 2 meters is cut out of one corner. What area is left?
Answer:
3.A rectangular rug is 8 meters by 5 meters. A rectangle 5 meters by 2 meters is cut out of one corner. What area is left?
Answer:
4.A rectangular sheet of cardboard is 6 feet by 6 feet. A rectangle 3 feet by 3 feet is cut out of one corner. What area is left?
Answer:
5.A rectangular sheet of cardboard is 7 feet by 9 feet. A rectangle 3 feet by 5 feet is cut out of one corner. What area is left?
Answer:
6.A rectangular lawn is 10 feet by 6 feet. A rectangle 6 feet by 2 feet is cut out of one corner. What area is left?
Answer:

LessonPrint · 3.MD.C.7 · Set 9 · free to copy for classroom use

Answer key — Cut-Out Corners

Set 9. Prints on its own sheet.

  1. 1.10 × 5 = 50; 2 × 2 = 4; 50 − 4 = 46 square feet
  2. 2.8 × 5 = 40; 4 × 2 = 8; 40 − 8 = 32 square meters
  3. 3.8 × 5 = 40; 5 × 2 = 10; 40 − 10 = 30 square meters
  4. 4.6 × 6 = 36; 3 × 3 = 9; 36 − 9 = 27 square feet
  5. 5.7 × 9 = 63; 3 × 5 = 15; 63 − 15 = 48 square feet
  6. 6.10 × 6 = 60; 6 × 2 = 12; 60 − 12 = 48 square feet

Last reviewed 2026-09-05. Aligned to 3.MD.C.7 of the Common Core State Standards for Mathematics.