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

LessonPrint · 3.MD.C.7 · Set 17 · free to copy for classroom use

Answer key — Cut-Out Corners

Set 17. Prints on its own sheet.

  1. 1.7 × 7 = 49; 2 × 3 = 6; 49 − 6 = 43 square meters
  2. 2.10 × 5 = 50; 4 × 2 = 8; 50 − 8 = 42 square meters
  3. 3.9 × 7 = 63; 2 × 4 = 8; 63 − 8 = 55 square feet
  4. 4.9 × 7 = 63; 5 × 3 = 15; 63 − 15 = 48 square meters
  5. 5.8 × 8 = 64; 5 × 2 = 10; 64 − 10 = 54 square meters
  6. 6.8 × 7 = 56; 5 × 2 = 10; 56 − 10 = 46 square feet

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