Perimeter of a rectangle

Grade 3 · Level 2 · Sheet 1

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the answers

Name Date

Free from tutor.in4me.app · 3.MD.C.5, 3.MD.C.6, 3.MD.C.7.a, 3.MD.C.7.b, 3.MD.C.7.c, 3.MD.D.8 · Five minutes a day online, and the difficulty follows your child.

1.
What is the perimeter of this rectangle?
5
9
Answer:
2.
What is the perimeter of this rectangle?
5
7
Answer:
3.
What is the perimeter of this rectangle?
7
6
Answer:
4.
What is the perimeter of this rectangle?
2
4
Answer:
5.
What is the perimeter of this rectangle?
6
5
Answer:
6.
What is the perimeter of this rectangle?
4
8
Answer:
7.
What is the perimeter of this rectangle?
2
7
Answer:
8.
What is the perimeter of this rectangle?
6
9
Answer:
9.
What is the perimeter of this rectangle?
4
2
Answer:
10.
What is the perimeter of this rectangle?
3
2
Answer:
11.
What is the perimeter of this rectangle?
10
6
Answer:
12.
What is the perimeter of this rectangle?
9
8
Answer:

Show the answer key

1.28
2.24
3.26
4.12
5.22
6.24
7.18
8.30
9.12
10.10
11.32
12.34

The mistakes behind most wrong answers

A wrong answer in perimeter of a rectangle is rarely random. These are the ones that come up most often, each on a real problem — worth knowing before you mark a sheet, because the fix for each is different.

What is the perimeter of this rectangle?
10
8
The answer is 36. A child who answers 18 probably added only two of the four sides.
What is the perimeter of this rectangle?
5
2
The answer is 14. A child who answers 15 probably counted one too many or too few.
What is the perimeter of this rectangle?
10
4
The answer is 28. A child who answers 40 probably multiplied the sides instead of adding round.

In the app, every wrong answer is matched against mistakes like these, and the weekly email tells you which one your child keeps making — in those words, not as a percentage.

Answer key · Perimeter of a rectangle · Level 2 · Sheet 1

The mistakes behind most wrong answers