三、口算。
25+5=
9×7=
55+14=
25+5=
30
80-60=20
64-8=56
9×7=
63
44+42=86
9×9=81
55+14=
69
78-67=11
54-38=16
答案:
25+5=30
80-60=20
64-8=56
9×7=63
44+42=86
9×9=81
55+14=69
78-67=11
54-38=16
80-60=20
64-8=56
9×7=63
44+42=86
9×9=81
55+14=69
78-67=11
54-38=16
1. 8在百位上的数是(
A.8066
B.6809
C.2908
B
)。A.8066
B.6809
C.2908
答案:
B
2. 下面的数一个零都不读的是(
A.2018
B.3007
C.1600
C
)。A.2018
B.3007
C.1600
答案:
C
3. 2600一百一百往下数,下一个数是(
A.2610
B.2700
C.3600
B
)。A.2610
B.2700
C.3600
答案:
B
4. 由2,0,0,8能组成(
A.4
B.5
C.6
C
)个不同的四位数。A.4
B.5
C.6
答案:
C
5. 从家到学校的距离是1980米,大约(
A.1800
B.1900
C.2000
C
)米。A.1800
B.1900
C.2000
答案:
C
五、照样子写数。
2577= (2000)+(500)+(70)+(7)
1234= (
9090= (
7801= (
2100= (
2577= (2000)+(500)+(70)+(7)
1234= (
1000
)+(200
)+(30
)+(4
)9090= (
9000
)+(90
)7801= (
7000
)+(800
)+(1
)2100= (
2000
)+(100
)
答案:
1234=
(1000)+
(200)+
(30)+
(4)
9090=
(9000)+
(90)
7801=
(7000)+
(800)+
(1)
2100=
(2000)+
(100)
(1000)+
(200)+
(30)+
(4)
9090=
(9000)+
(90)
7801=
(7000)+
(800)+
(1)
2100=
(2000)+
(100)
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