Draw a line 10 cm long. Paint over 2/5 of this line with red pencil, what is the length of the red line?

In order to find a part of a number, you need to multiply this number by a part. Let’s calculate how much of a 10-centimeter segment will be red, knowing that it is 2/5 of this segment.

10 * 2/5 = (10 * 2) / 5 = 20/5 = 4 cm.

In order to multiply an integer by an ordinary fraction, you need to multiply this number by the numerator of the fraction, that is, 2, and divide the result by the denominator 5.

Answer: 4 centimeters.

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