1. 口算。
$10 - 3 =$ $4 + 6 =$ $10 - 5 =$ $9 - 6 =$ $2 + 8 =$
$10 - 4 =$ $3 + 5 =$ $8 - 5 =$ $9 - 3 =$ $9 + 1 =$
$5 + 5 =$ $6 + 4 =$ $9 - 7 =$ $10 - 7 =$ $3 + 6 =$
$10 - 9 =$ $8 - 3 =$ $4 + 3 =$ $6 + 4 =$ $9 - 0 =$
$8 + 2 =$ $7 + 3 =$ $8 + 2 =$ $10 - 6 =$ $9 - 4 =$
$10 - 3 =$ $4 + 6 =$ $10 - 5 =$ $9 - 6 =$ $2 + 8 =$
$10 - 4 =$ $3 + 5 =$ $8 - 5 =$ $9 - 3 =$ $9 + 1 =$
$5 + 5 =$ $6 + 4 =$ $9 - 7 =$ $10 - 7 =$ $3 + 6 =$
$10 - 9 =$ $8 - 3 =$ $4 + 3 =$ $6 + 4 =$ $9 - 0 =$
$8 + 2 =$ $7 + 3 =$ $8 + 2 =$ $10 - 6 =$ $9 - 4 =$
答案:
1. 7 10 5 3 10 6 8 3 6 10
10 10 2 3 9 1 5 7 10 9
10 10 10 4 5
10 10 2 3 9 1 5 7 10 9
10 10 10 4 5
2. 找规律填数。

答案:
2. 7 9 8
3.

原来有(
,卖掉了(
$□ ◯ □ = □$
原来有(
10
)头7
)头,还剩(3
)头。$□ ◯ □ = □$
答案:
3. 10 7 3 10-7=3
4.

(1)从右边数起,第(
。
(2)从左边数起,第(
(1)从右边数起,第(
2
)盘有8个(2)从左边数起,第(
1
)盘和第(3
)盘合起来正好是10个,第(2
)盘和第(4
)盘合起来也是10个。
答案:
4.
(1)2
(2)1 3 2 4
(1)2
(2)1 3 2 4
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