1. 口算。
$6 + 2 =$ $6 - 4 =$ $2 + 6 =$ $3 + 3 =$ $4 + 3 =$
$9 - 4 =$ $2 + 7 =$ $5 + 2 =$ $9 - 2 =$ $3 + 6 =$
$9 - 8 =$ $1 + 8 =$ $7 - 5 =$ $5 + 3 =$ $7 - 3 =$
$7 - 1 =$ $5 + 4 =$ $9 - 6 =$ $8 - 4 =$ $9 - 3 =$
$4 + 2 =$ $8 - 4 =$ $8 - 2 =$ $8 - 7 =$ $3 + 4 =$
$6 + 2 =$ $6 - 4 =$ $2 + 6 =$ $3 + 3 =$ $4 + 3 =$
$9 - 4 =$ $2 + 7 =$ $5 + 2 =$ $9 - 2 =$ $3 + 6 =$
$9 - 8 =$ $1 + 8 =$ $7 - 5 =$ $5 + 3 =$ $7 - 3 =$
$7 - 1 =$ $5 + 4 =$ $9 - 6 =$ $8 - 4 =$ $9 - 3 =$
$4 + 2 =$ $8 - 4 =$ $8 - 2 =$ $8 - 7 =$ $3 + 4 =$
答案:
1. 8 2 8 6 7 5 9 7 7 9
1 9 2 8 4 6 9 3 4 6
6 4 6 1 7
1 9 2 8 4 6 9 3 4 6
6 4 6 1 7
2. 算一算,想一想。
$5 + 4 =$ $7 + 2 =$ $3 + 5 =$ $2 + 4 =$ $4 + 3 =$
$9 - 5 =$ $9 - 7 =$ $8 - 3 =$ $6 - 2 =$ $7 - 4 =$
$5 + 4 =$ $7 + 2 =$ $3 + 5 =$ $2 + 4 =$ $4 + 3 =$
$9 - 5 =$ $9 - 7 =$ $8 - 3 =$ $6 - 2 =$ $7 - 4 =$
答案:
2. 9 9 8 6 7 4 2 5 4 3
3. 画一画,算一算。

$6 + 3 = □$

$9 - 3 = □$
$6 + 3 = □$
$9 - 3 = □$
答案:
3.
9

6
3.
9
6
4. 有9片荷叶,小青蛙跳了2片,没跳的有(

$□ - □ = □$
7
)片。$□ - □ = □$
答案:
4. 7 9-2=7
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