Khoanh vào những phân số bằng \(\displaystyle{{25} \over {100}}\):
\(\displaystyle{5 \over {20}}\,\,\,\,;\,\,\,\,{{15} \over {65}}\,\,\,\,;\,\,\,\,{3 \over {12}}\,\,\,\,;\,\,\,\,{8 \over 2}\,\,\,\,;\,\,\,\,{{20} \over {80}}\)
\(\dfrac{25}{100}=\dfrac{ 25: 25}{ 100: 25}=\dfrac{1}{4}\) \(\dfrac{5}{20}=\dfrac{5 : 5}{20 : 5}=\dfrac{1}{4}\)
\(\dfrac{15}{65}=\dfrac{15 :5 }{65 :5 }=\dfrac{3}{13}\) \(\dfrac{3}{12}=\dfrac{3 :3 }{12 :3 }=\dfrac{1}{4}\)
\(\dfrac{8}{2}=\dfrac{ 8:2 }{2 :2 }=\dfrac{4}{1}=4\) \(\dfrac{20}{80}=\dfrac{ 20:20 }{80 : 20}=\dfrac{1}{4}\).
Vậy ta có kết quả như sau:
-- Mod Toán lớp 4