Length: 0:37Mirror and CompleteTo the left of the line, 7 squares are colored. How many squares does the whole shape have?Grade 4Learning video 83 · Geometry
The Missing Side
Watch and solve along: the video pauses when the question comes. Type your answer, then watch the solution.
Read the story
A rectangle has a perimeter of 18 centimeters. It is 5 centimeters long.
How wide is it? One length plus one width is exactly half the way around.
Half of 18 is 9.
9 minus 5 is 4. The rectangle is 4 centimeters wide.
A rectangle has a perimeter of 30 cm and is 9 cm long. How wide is it?
Answer and working
Correct! Half of 30 is 15. 15 minus 9 is 6 centimeters.
30 ÷ 2 − 9 = 6
Geometry
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