영어로 배우는 초등학교 5학년 수학 - 소수의 나눗셈 / Division of Decimal [ 영문 ]

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     영어로 배우는 초등학교 5학년 수학 - 소수의 나눗셈  

                                                   Practice  Quiz        

1.  The area of rectangle below is 12.2 cm².  Find the height of this rectangle.      

    Solution        The area of a rectangle is the product of its base and height. 

                                      ◈  Area of a Rectangle  =  Base  ×  Height 

                                                        

 In this question, the base of the rectangle is 4 cm, and the area of the rectangle is 12.2 cm².   

        Therefore,      12.2  =  4 × height

                             height  =  12.2 ÷ 4 = 3.05 (cm)

    Answer  :  3.05 (cm)

 
2.  Kathleen made a square-shaped flower garden in front of her house.  The perimeter of her garden is 6.4 m.   Find the length of one side of this flower garden.

 Solution    The perimeter of the flower garden is 6.4 (m).  To find the length of one side of the square, we need to divide the perimeter by 4.  Because the lengths of four sides are all the same in a square.   Therefore,  6.4 ÷ 4 =  1.6 (m)

Answer  :  1.6  (m)

 3.  The area of the triangle below is 182.7 cm².  Find the height of this triangle.   

                                    

 Solution         Let the height be (     ) cm.   Then, 18 × (    ) × 1 / 2  = 182.7

                                     9  ×  (    )  = 182.7

                                   (     ) = 182.7 ÷ 9  = 20.3 (cm)

Answer  :  20.3  (cm)

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