一、写一写。

答案
0
二、数一数,写一写。

答案
0
1
2
4
3
5
1
2
4
3
5
四、看图列式计算。
1.

$□+□=□$
2.

$□+□=□$
3.

$□-□=□$
4.

$□-□=□$
1.
$□+□=□$
2.
$□+□=□$
3.
$□-□=□$
4.
$□-□=□$
答案
1. 2+0=2
2. 0+4=4
3. 2-2=0
4. 5-5=0
2. 0+4=4
3. 2-2=0
4. 5-5=0
五、算一算。
$3 - 3 =$ $0 + 3 =$ $0 - 0 =$
$0 + 2 =$ $4 + 0 =$ $3 + 2 =$
$0 + 0 =$ $5 - 5 =$ $0 + 4 =$
$2 - 0 =$ $5 - 0 =$ $4 - 4 =$
$3 - 3 =$ $0 + 3 =$ $0 - 0 =$
$0 + 2 =$ $4 + 0 =$ $3 + 2 =$
$0 + 0 =$ $5 - 5 =$ $0 + 4 =$
$2 - 0 =$ $5 - 0 =$ $4 - 4 =$
答案
$3 - 3 = 0$
$0 + 3 = 3$
$0 - 0 = 0$
$0 + 2 = 2$
$4 + 0 = 4$
$3 + 2 = 5$
$0 + 0 = 0$
$5 - 5 = 0$
$0 + 4 = 4$
$2 - 0 = 2$
$5 - 0 = 5$
$4 - 4 = 0$
$0 + 3 = 3$
$0 - 0 = 0$
$0 + 2 = 2$
$4 + 0 = 4$
$3 + 2 = 5$
$0 + 0 = 0$
$5 - 5 = 0$
$0 + 4 = 4$
$2 - 0 = 2$
$5 - 0 = 5$
$4 - 4 = 0$
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