Rút gọn các phân số a) 2/ 6 ; 3/ 6 ; 5/ 10 ; 7/ 14 b) 4 /12 ; 9/ 36 ; 16/ 24 ; 15 /30

Giải Toán lớp 4 Bài 63: Rút gọn phân số

Toán lớp 4 Tập 2 trang 50 Bài 1: Rút gọn các phân số.

a) $\frac{\text{2}}{\text{6}}\text{;}\frac{\text{3}}{\text{6}}\text{;}\frac{\text{5}}{\text{10}}\text{;}\frac{\text{7}}{\text{14}}$

b) $\frac{\text{4}}{\text{12}}\text{;}\frac{9}{\text{36}}\text{;}\frac{\text{16}}{\text{24}}\text{;}\frac{\text{15}}{\text{30}}$

Lời giải:

a) $\frac{\text{2}}{\text{6}}=\frac{2:2}{6:2}\text{=}\frac{1}{3}$

$\frac{\text{3}}{\text{6}}=\frac{3:3}{6:3}\text{=}\frac{1}{2}$

$\frac{\text{5}}{\text{10}}=\frac{5:5}{10:5}\text{=}\frac{1}{2}$

$\frac{\text{7}}{\text{14}}=\frac{7:7}{14:7}\text{=}\frac{1}{2}$

b) $\frac{\text{4}}{\text{12}}=\frac{4:4}{12:4}\text{=}\frac{1}{3}$

$\frac{9}{\text{36}}=\frac{9:9}{36:9}\text{=}\frac{1}{4}$

$\frac{\text{16}}{\text{24}}=\frac{16:8}{24:8}\text{=}\frac{2}{3}$

$\frac{\text{15}}{\text{30}}=\frac{15:15}{30:15}\text{=}\frac{1}{2}$