Question

Для обложки альбома из картона вырезают прямоугольник длиной 4дм и шириной 3дм.Сколько КВАДРАТНЫХ дециметров пойдёт на 5 таких альбомов? решить задачу по действиям с кратким пояснениями.

Answer 1

3дм-30 см,4дм-40см
1)30+40*2=140периметр
2)140*5=700
3)700:2=350
4)350:10=35квадратных дециметров

Answer 2

Problem Analysis

To solve this problem, we need to find the number of square decimeters that will be used for 5 albums made from cardboard. The dimensions of each album are given as a rectangle with a length of 4 dm and a width of 3 dm.

Solution

To find the area of the rectangle, we multiply the length by the width. In this case, the area of each album is 4 dm * 3 dm = 12 square decimeters.

To find the total area used for 5 albums, we multiply the area of one album by the number of albums. Therefore, the total area used for 5 albums is 12 square decimeters * 5 = 60 square decimeters.

So, 60 square decimeters will be used for 5 albums made from cardboard.

Answer

60 square decimeters will be used for 5 albums made from cardboard.

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