一、直接写出得数。
$\frac{1}{3}+\frac{1}{3}=$
$\frac{4}{6}+\frac{2}{6}=$
$\frac{3}{9}+\frac{4}{9}=$
$\frac{1}{5}+\frac{2}{5}=$
$\frac{1}{6}+\frac{4}{6}=$
$\frac{1}{10}+\frac{7}{10}=$
$\frac{2}{3}+\frac{1}{3}=$
$\frac{1}{8}+\frac{1}{8}=$
$\frac{2}{9}+\frac{3}{9}=$
$\frac{1}{10}+\frac{4}{10}=$
$\frac{2}{4}+\frac{2}{4}=$
$\frac{5}{9}+\frac{2}{9}=$
$\frac{2}{4}+\frac{1}{4}=$
$\frac{3}{5}+\frac{1}{5}=$
$\frac{7}{10}+\frac{2}{10}=$
$\frac{3}{6}+\frac{2}{6}=$
$\frac{2}{7}+\frac{4}{7}=$
$\frac{7}{8}+\frac{1}{8}=$
$\frac{1}{6}+\frac{1}{6}=$
$\frac{1}{7}+\frac{2}{7}=$
$\frac{4}{9}+\frac{4}{9}=$
$\frac{3}{4}+\frac{1}{4}=$
$\frac{2}{7}+\frac{2}{7}=$
$\frac{4}{8}+\frac{3}{8}=$
$\frac{2}{7}+\frac{3}{7}=$
$\frac{4}{8}+\frac{1}{8}=$
$\frac{1}{6}+\frac{2}{6}=$
$\frac{1}{9}+\frac{7}{9}=$
$\frac{1}{3}+\frac{1}{3}=$
$\frac{4}{6}+\frac{2}{6}=$
$\frac{3}{9}+\frac{4}{9}=$
$\frac{1}{5}+\frac{2}{5}=$
$\frac{1}{6}+\frac{4}{6}=$
$\frac{1}{10}+\frac{7}{10}=$
$\frac{2}{3}+\frac{1}{3}=$
$\frac{1}{8}+\frac{1}{8}=$
$\frac{2}{9}+\frac{3}{9}=$
$\frac{1}{10}+\frac{4}{10}=$
$\frac{2}{4}+\frac{2}{4}=$
$\frac{5}{9}+\frac{2}{9}=$
$\frac{2}{4}+\frac{1}{4}=$
$\frac{3}{5}+\frac{1}{5}=$
$\frac{7}{10}+\frac{2}{10}=$
$\frac{3}{6}+\frac{2}{6}=$
$\frac{2}{7}+\frac{4}{7}=$
$\frac{7}{8}+\frac{1}{8}=$
$\frac{1}{6}+\frac{1}{6}=$
$\frac{1}{7}+\frac{2}{7}=$
$\frac{4}{9}+\frac{4}{9}=$
$\frac{3}{4}+\frac{1}{4}=$
$\frac{2}{7}+\frac{2}{7}=$
$\frac{4}{8}+\frac{3}{8}=$
$\frac{2}{7}+\frac{3}{7}=$
$\frac{4}{8}+\frac{1}{8}=$
$\frac{1}{6}+\frac{2}{6}=$
$\frac{1}{9}+\frac{7}{9}=$
答案
1.$\frac{2}{3}$ 2.$1$ 3.$\frac{7}{9}$ 4.$\frac{3}{5}$ 5.$\frac{5}{6}$ 6.$\frac{8}{10}$ 7.$1$ 8.$\frac{2}{8}$ 9.$\frac{5}{9}$ 10.$\frac{5}{10}$ 11.$1$ 12.$\frac{7}{9}$ 13.$\frac{3}{4}$ 14.$\frac{4}{5}$ 15.$\frac{9}{10}$ 16.$\frac{5}{6}$ 17.$\frac{6}{7}$ 18.$1$ 19.$\frac{2}{6}$ 20.$\frac{3}{7}$ 21.$\frac{8}{9}$ 22.$1$ 23.$\frac{4}{7}$ 24.$\frac{7}{8}$ 25.$\frac{5}{7}$ 26.$\frac{5}{8}$ 27.$\frac{3}{6}$ 28.$\frac{8}{9}$
二、看图列式计算。

($\frac{4}{10}$)+($\frac{5}{10}$)=($\frac{9}{10}$)
($\frac{3}{6}$)+($\frac{3}{6}$)=($\frac{6}{6}$)
($\frac{4}{10}$)+($\frac{5}{10}$)=($\frac{9}{10}$)
($\frac{3}{6}$)+($\frac{3}{6}$)=($\frac{6}{6}$)
答案
$\frac{4}{10}+\frac{5}{10}=\frac{9}{10}$
$\frac{3}{6}+\frac{2}{6}=\frac{5}{6}$
$\frac{3}{6}+\frac{2}{6}=\frac{5}{6}$
三、一根彩带,第一次用去全长的$\frac{2}{7}$,第二次比第一次多用去全长的$\frac{1}{7}$。两次一共用去全长的$\frac{(\quad)}{(\quad)}$。
1. 2. 3. 4.
5. 6. 7. 8.
1. 2. 3. 4.
5. 6. 7. 8.
答案
$\frac{5}{7}$
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