2、在○里填上"+"、"-"。(9分)
3 ○ 6 = 9 10 ○ 5 = 5 7 ○ 3 = 4
6 ○ 3 = 3 2 ○ 8 = 10 1 ○ 0= 1
4 ○ 1 = 3 1 ○ 2 = 3 5 ○ 5 = 0
3、在括号里填上合适的数。(9分)
6 + ( )= 7 5 + ( )= 8 4 + ( )= 9
( )+ 1 = 9 3 + ( )= 9 8-( ) = 2
7 -( ) = 5 6 - ( )= 4 0 + ( )= 6
三、画一画,算一算。(16分)
○○○ ○ ○ 3+ 2 = 5 例:
○○○○ 4 + 3 = ○ 1 + 4 =
○○○○○ 5 - 2 =
○○○○ 4 - 3 =