1. 口算。
$5 + 0 =$ $5 - 2 =$ $5 - 3 =$ $0 + 5 =$ $2 + 1 =$
$3 - 0 =$ $5 - 1 =$ $1 - 0 =$ $5 - 4 =$ $3 + 2 =$
$4 + 0 =$ $4 - 2 =$ $4 - 3 =$ $0 + 4 =$ $4 + 1 =$
$4 - 0 =$ $2 - 2 =$ $2 - 0 =$ $5 - 0 =$ $3 - 3 =$
$5 + 0 =$ $5 - 2 =$ $5 - 3 =$ $0 + 5 =$ $2 + 1 =$
$3 - 0 =$ $5 - 1 =$ $1 - 0 =$ $5 - 4 =$ $3 + 2 =$
$4 + 0 =$ $4 - 2 =$ $4 - 3 =$ $0 + 4 =$ $4 + 1 =$
$4 - 0 =$ $2 - 2 =$ $2 - 0 =$ $5 - 0 =$ $3 - 3 =$
答案:
1. 5 3 2 5 3
3 4 1 1 5
4 2 1 4 5
4 0 2 5 0
3 4 1 1 5
4 2 1 4 5
4 0 2 5 0
2. 看图列式计算。

$□ + □ = □$

$□ + □ = □$
$□ + □ = □$
$□ + □ = □$
答案:
2. 3+2=5 0+4=4
3.

$□ + □ = □$

$□ - □ = □$
$□ + □ = □$
$□ - □ = □$
答案:
3. 1+3=4 4-1=3
4. 在$◯$里填上“+”或“-”,使等式成立。
$2◯ 3 = 5$ $5◯ 1 = 4$ $5◯ 0 = 5$ $2◯ 2 = 4$
$0◯ 3 = 3$ $4◯ 1 = 3$ $5◯ 3 = 2$ $2◯ 1 = 1$
$2◯ 3 = 5$ $5◯ 1 = 4$ $5◯ 0 = 5$ $2◯ 2 = 4$
$0◯ 3 = 3$ $4◯ 1 = 3$ $5◯ 3 = 2$ $2◯ 1 = 1$
答案:
4. + - +(或-) +
+ - - -
+ - - -
5. 解决问题。
一只小猫钓了5条鱼,晚饭吃掉了2条,还剩下多少条鱼?
$□ - □ = □$
一只小猫钓了5条鱼,晚饭吃掉了2条,还剩下多少条鱼?
$□ - □ = □$
答案:
5. 5-2=3
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