1. 算一算

6+7=          3+7=          5+7=          4+7=

6+5=          6+4=          6+8=          6+9=

8+2=          8+5=          8+3=          8+7=

0+9=          10+9=         4+9=          6+9=

6+4=          5+8=          9+1=          5+5=