Question

От мотка веревки сначала отрезали 9дм потом 120 см Насколько уменьшилась длина веревки

Answer 1

9дм=90 см
90+120=210
На 210см уменьшилась длина веревки

Answer 2

Calculating the Decrease in Rope Length

To calculate the decrease in the length of the rope, we need to convert the given measurements to the same unit. The initial length of the rope was 9 decimeters, and then 120 centimeters were cut off.

1 decimeter (dm) = 10 centimeters (cm)

So, the initial length of the rope in centimeters is: 9 decimeters * 10 = 90 centimeters

Now, we can calculate the decrease in length: Initial length - Length cut off = Decrease in length 90 cm - 120 cm = -30 cm

Therefore, the length of the rope decreased by 30 centimeters.