90÷30=
92÷30≈
210÷70=
210÷72≈
540÷90=
543÷90≈
280÷70=
284÷70≈
360÷60=
362÷60≈
450÷30=
452÷30≈
240÷40=
240÷39≈
640÷80=
639÷80≈
630÷70=
630÷72≈
810÷90=
809÷90≈
62×7=
43×8=
51×6=
92×3=
44×2=
86×5=
32×5=
11×7=
64×9=
42×5=
3
92÷30≈
3
210÷70=
3
210÷72≈
3
540÷90=
6
543÷90≈
6
280÷70=
4
284÷70≈
4
360÷60=
6
362÷60≈
6
450÷30=
15
452÷30≈
15
240÷40=
6
240÷39≈
6
640÷80=
8
639÷80≈
8
630÷70=
9
630÷72≈
9
810÷90=
9
809÷90≈
9
62×7=
434
43×8=
344
51×6=
306
92×3=
276
44×2=
88
86×5=
430
32×5=
160
11×7=
77
64×9=
576
42×5=
210
答案:
解析:本题主要考查除法的基本运算及估算。在进行除法估算时,一般要把被除数看作是能被除数整除的整十,整百,或几百几十$\cdots\cdots$的数来进行计算。
答案:
$90 ÷ 30 = 3$
$92 ÷ 30 \approx 3$
$210 ÷ 70 = 3$
$210 ÷ 72 \approx 3$
$540 ÷ 90 = 6$
$543 ÷ 90 \approx 6$
$280 ÷ 70 = 4$
$284 ÷ 70 \approx 4$
$360 ÷ 60 = 6$
$362 ÷ 60 \approx 6$
$450 ÷ 30 = 15$
$452 ÷ 30 \approx 15$
$240 ÷ 40 = 6$
$240 ÷ 39 \approx 6$
$640 ÷ 80 = 8$
$639 ÷ 80 \approx 8$
$630 ÷ 70 = 9$
$630 ÷ 72 \approx 9$
$810 ÷ 90 = 9$
$809 ÷ 90 \approx 9$
$62 × 7 = 434$
$43 × 8 = 344$
$51 × 6 = 306$
$92 × 3 = 276$
$44 × 2 = 88$
$86 × 5 = 430$
$32 × 5 = 160$
$11 × 7 = 77$
$64 × 9 = 576$
$42 × 5 = 210$
答案:
$90 ÷ 30 = 3$
$92 ÷ 30 \approx 3$
$210 ÷ 70 = 3$
$210 ÷ 72 \approx 3$
$540 ÷ 90 = 6$
$543 ÷ 90 \approx 6$
$280 ÷ 70 = 4$
$284 ÷ 70 \approx 4$
$360 ÷ 60 = 6$
$362 ÷ 60 \approx 6$
$450 ÷ 30 = 15$
$452 ÷ 30 \approx 15$
$240 ÷ 40 = 6$
$240 ÷ 39 \approx 6$
$640 ÷ 80 = 8$
$639 ÷ 80 \approx 8$
$630 ÷ 70 = 9$
$630 ÷ 72 \approx 9$
$810 ÷ 90 = 9$
$809 ÷ 90 \approx 9$
$62 × 7 = 434$
$43 × 8 = 344$
$51 × 6 = 306$
$92 × 3 = 276$
$44 × 2 = 88$
$86 × 5 = 430$
$32 × 5 = 160$
$11 × 7 = 77$
$64 × 9 = 576$
$42 × 5 = 210$
连一连,在( )里最大能填几
50×(
60×(
80×(
90×(
70×(

80×(
40×(
30×(
20×(
80×(
50×(
6
)<32060×(
7
)<45080×(
8
)<66090×(
6
)<56070×(
7
)<50080×(
5
)<41040×(
6
)<26030×(
5
)<16020×(
8
)<17080×(
7
)<590
答案:
50×
(6)<320
60×
(7)<450
80×
(8)<660
90×
(6)<560
70×
(7)<500
80×
(5)<410
40×
(6)<260
30×
(5)<160
20×
(8)<170
80×
(7)<590
连线:
50×
(6)——6
60×
(7)——7
80×
(8)——8
90×
(6)——6
70×
(7)——7
80×
(5)——5
40×
(6)——6
30×
(5)——5
20×
(8)——8
80×
(7)——7
(6)<320
60×
(7)<450
80×
(8)<660
90×
(6)<560
70×
(7)<500
80×
(5)<410
40×
(6)<260
30×
(5)<160
20×
(8)<170
80×
(7)<590
连线:
50×
(6)——6
60×
(7)——7
80×
(8)——8
90×
(6)——6
70×
(7)——7
80×
(5)——5
40×
(6)——6
30×
(5)——5
20×
(8)——8
80×
(7)——7
查看更多完整答案,请扫码查看