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1. 口算。
$5 + 3 + 1 =$ $6 - 4 - 2 =$ $3 + 2 + 4 =$ $9 - 2 - 5 =$
$3 + 0 + 6 =$ $8 - 2 - 3 =$ $2 + 3 + 4 =$ $7 - 0 - 3 =$
$5 + 3 + 1 =$ $6 - 4 - 2 =$ $3 + 2 + 4 =$ $9 - 2 - 5 =$
$3 + 0 + 6 =$ $8 - 2 - 3 =$ $2 + 3 + 4 =$ $7 - 0 - 3 =$
答案：
1. 9 0 9 2 9 3 9 4
2. 在$〇$里填上“$＞$”“$＜$”或“$=$”。
$4 + 3 + 2$$〇$$9$ $6 - 4 - 1$$〇$$2$ $8 - 5 + 4$$〇$$7$
$7 - 1 + 2$$〇$$8$ $9 - 6 - 1$$〇$$2$ $2 + 7 - 4$$〇$$6$
$4 + 3 + 2$$〇$$9$ $6 - 4 - 1$$〇$$2$ $8 - 5 + 4$$〇$$7$
$7 - 1 + 2$$〇$$8$ $9 - 6 - 1$$〇$$2$ $2 + 7 - 4$$〇$$6$
答案：
2. = ＜ = = = ＜
3.
$□〇□〇□=□$
$□〇□〇□=□$
$□〇□〇□=□$
$□〇□〇□=□$
答案：
3. 4+3+2=9 8-4-4=0
4. 看图列式计算。
(1)
$□〇□〇□=□$
(2)一共有多少个
$?$
$□〇□〇□=□$
(3)
$□〇□〇□=□$
(4)
$□〇□〇□=□$
(1)
$□〇□〇□=□$
(2)一共有多少个
$?$$□〇□〇□=□$
(3)
$□〇□〇□=□$
(4)
$□〇□〇□=□$
答案：
4.
(1)9-4-3=2
(2)3+2+3=8
(3)3+4+2=9
(4)9-3-1=5
(1)9-4-3=2
(2)3+2+3=8
(3)3+4+2=9
(4)9-3-1=5
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