mt 1.pptx
TRANSCRIPT
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第一课： 100 000 以内的整
数• 读出和写出整数
• 数位和数值
• 顺序和逆序
• 数列的模式
• 估一估
• 近似值
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35 000
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一万三千
八万九千九百九
十一
万九千!百
40 600
18 50890 002
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90 000 + 8 000 + 3
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"
2百
# 8 十位
"
4万
# 7 千位
"
0$
# 6 万位
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%
8 5
数值 800
0
5
%
9 0
数值 9000
0
0
%
0 6
数值 0 6
2 $万 + 8 $
千+ 2
$十+
5 $一
9 $万 + 2 $
百 + 5 $一
8 $万 + 3 $
千 + 6 $一
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9
1 2
8
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32
760
逆序
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X3
X2
X4
X5
X
2
X
3
X
4
X
5
10
800
75
600
604800
X
6
X
7
X
8
23
040161
280 1 290
240X
6 X
7 X
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X
3
X
3
X
3
X
3
X
3
+
10
+
20
+
30
+
40
X
3
X
3
X
3
X
3
X
3
+
10
+
20
+
30
+
40
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• 4 ' = 3200
• 1 ' = 3200 ÷4
= 800#( )* +*
• 16'
= 16 x 800
= 12 800
• ,-.位#(/ 12 800 $0• ,-.位
)*
1-.位0• 46 ' = 46 x 800
= 36 800• 23-.位
#(
/ 36 800 $
0• 23-.位
)*
1-.位和,
-.位0• 28
'= 28 x 800
= 22 400
• 43-.位#(
/ 22 400 $
0• 43-.位)*1-.位和,
-.位+*25-.位0
• 6 ' = 6 x 800
= 4 800
• 6-.位#(
/ 4 800
$0• 6-.位)*1-.位
+*,-.位725-.位和43-.位0
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估一估
• 16 ' = 16 x 800
= 12 800
• ,-.位#(/ 12 800 $0• ,-.位)*1-.位0
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十位 63854
05836
百
位
63
854
00
+
1
936
千
位 63
854000
+
1
46
万
位
63
854
00006
89:;0 7 1 7 2 7 3
7 4
<=位5 7 6 7 7 7 8
7 9
= 1
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7 8 2 6 8十位近似值
： 07287
78 265 78 266 78 267 78 269 78 271
78 272 78 273 78 274
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2760027 553
27 563
27 573
27 593
27 610 >
60 90060 916
60 925
60 934
60 947
60 859 >
20 00019 955
19 986
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51600
51500
51700
51
550
51
649
" #
?"的数@： 51 500
?#的数@： 51649
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千
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48 450 82 795 99 508
76 000 74 000 74 000
48
000
83
000
100
000
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39 00038 000 40 000
38 500 39 499
38
564
38
612
38
759
39
206
39
385
AB 38 500 C 39 499 DE的数@
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60 00050 000 70 00
55 000 64 999
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20
000
30
000
80
000
100
000
90000
89000
91000
89
500
90
499
90
000
千位近似值
万位近似值
80
000
100
000
85
000
94
999
89 89 89 90 90
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