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3 years ago

Mary buys a 10-meter spool of thread for sewing. She uses 210 centimeters. How much is left on the spool in centimeters?

Mathematics

1 answer:

Margaret [11]3 years ago

6 0

100 cm = 1 meter

210 cm = 2.1 meters (multiply both sides by 2.1)

Mary uses 2.1 meters of thread so far, meaning she has 10-2.1 = 7.9 meters left

7.9 meters = (7.9 m)*(100 cm/1 m) = 790 cm

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Alternate route:

10 meters = (10 m)*(100 cm/1 m) = 1000 cm

Mary uses 210 cm out of 1000 cm total, so she has 1000-210 = 790 cm left.

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<h3>Answer: 790 cm</h3>

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Perimeter of rectangle = ⇒ $18\frac{1}{6}$ feet

Step-by-step explanation:

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Length of a rectangular sand box = $5\frac{1}{3}\ feet$

Width of the box = $3\frac{3}{4}\ feet$

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Perimeter of sand box = $2(5\frac{1}{3}+3\frac{3}{4})\ feet$

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Simplifying fractions to simplest form.

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