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1, 2.5+0.9 = 3.6+4.9 = 5.6 4.8 = 31.6 = 3.06+4.4 = 8.8+4.5 = 5.2+4.8 = 32.9 = 2. Calculate the following problem, check 3.64+6544.
1, 2.5+0.9 = 3.6+4.9 = 5.6-4.8 = 3-1.6 = 3.06+4.4 = 8.8+4.5 = 5.2+4.8 = 3-2.9 = 2. Calculate the following questions.
First, oral calculation.
2. 1+0.2= 0.3+0.7= 3.6+ 1.6= 7.5-0.5= 3.7-0.9= 2. 13-0.02= 3.5 1+0.2= 102+0.3= 1. 12- 1.02= 4.5-0.0 1=
Second, the eyes are right and wrong, and correct them.
( 1) 12.45- 1.35-0.65 (2)2 1.32-(6.32+8.3)
=2 1.32-6.32+8.3 = 12.45-( 1.35+0.65)
= 15+8.3 = 12.45-2
=23.3 ( ) = 10.45 ( )
Third, use a simple method to calculate.
( 1)27.3+73.2+72.7 (2) 585+ 189+2 15 (3) 5.85- 1.75-0.25
(4)768-274- 126 (5) 5.85+ 1.89+2. 15 (6)24.8+ 14.6+ 15.4
(7)42.5-22. 17-7.83 (8)3.8+ 1.37+6.2+ 12.63
Fourth, with a sharp eye, right and wrong are clear.
(1) Integer additive commutative law and associative law also apply to decimal-().
(2)4.72+0. 1-4.72+0. 1=0 - ( )
(3) Calculate decimal addition and subtraction. If the decimal part of the number has 0, delete 0- ()
(4) The mixed operation of decimal addition and subtraction must be added first, and then subtracted-()
Fifth, solve the problem.
1. One morning, the temperature was 6.5℃, which was 3. 1℃ higher at noon and 4.5℃ lower at night than at noon. What is the temperature tonight?
2. Mom spent 5.8 yuan on fruits, 2.6 yuan on vegetables and 5.2 yuan on fish, more than the sum of fruits and vegetables. How much did she spend on fish?
3. Students in Qian Lou Central Primary School collect tree species on Sundays. In the first week, they collected 2.8 kilograms, and in the second week, they collected 0. 13 kilograms less than in the first week. How many kilograms were collected in two weeks?
Xiao Ming's father bought a bottle of salad oil, 3.4 kilograms. Half of the oil is used, and the bottle weighs 1.9 kg. Do you know how many kilograms this bottle of oil used to have? How much does this bottle weigh?
5. Xiao Fang went to the bookstore to buy books, paid 30 yuan and got back 26.4 yuan. Xiao Fang found that the salesgirl gave her 2 1.8 yuan and asked the salesgirl how much she should actually give Xiao Fang. What's the price of this book?
6. The average height of the fourth grade boys in Qian Lou Central Primary School is 122.8cm, and the third grade boys are shorter than the fourth grade boys14.2cm.. Wu Haoran is a boy in Class Two, Grade Three, and his height is1.25m. How much taller is Wu Haoran than the boy in Grade Three?
Supplementary Report of Respondent 20 10-08-06 16:20
5+ 1= 5+7= 5+9= 9+8= 4+6=
3+ 1= 3+7= 7+4= 1+8= 3+5=
3+6= 6+7= 6+3= 6+5= 5+9=
6+3= 8+2= 5+4= 9+5= 2+6=
5+2= 3+9= 5+5= 8+2= 5+9=
4+8= 6+ 1= 9+3= 9+8= 8+3=
7+2= 1+9= 8+4= 2+4= 4+5=
3+4= 9+9= 4+8= 9+3= 9+9=
8+9= 5+2= 5+5= 2+8= 8+4=
9+2= 7+ 1= 2+6= 6+9= 1+8=
2+5= 5+5= 7+8= 6+5= 3+5=
2+8= 4+5= 1+4= 9+8= 1+2=
1+3= 7+8= 7+5= 1+2= 6+4=
3+5= 9+2= 4+ 1= 3+7= 1+9=
2+9= 9+5= 5+9= 5+7= 3+ 1=
2+6= 4+9= 2+ 1= 2+3= 7+7=
1+3= 8+9= 2+8= 3+2= 2+4=
7+9= 6+4= 8+9= 7+6= 9+5=
4+3= 6+2= 3+6= 8+6= 4+3=
3+9= 7+4= 4+4= 7+ 1= 7+ 1=
8+5= 5+9= 6+9= 5+5= 4+7=
8+8= 2+9= 7+ 1= 2+7= 8+5=
The report supplemented the respondents 2010-08-0616: 215+1= 4+2 = 8+3 = 4+2 = 6+7 =
4+4= 3+8= 4+4= 8+5= 4+9=
4+ 1= 2+2= 7+2= 4+5= 8+4=
4+6= 9+7= 1+9= 5+3= 2+9=
5+2= 3+4= 5+5= 1+7= 6+ 1=
6+6= 9+8= 2+3= 7+8= 5+8=
9+3= 3+ 1= 6+3= 9+9= 1+2=
3+2= 9+3= 3+ 1= 7+5= 8+4=
3+2= 6+9= 8+7= 7+8= 8+3=
8+7= 8+3= 2+4= 7+5= 9+4=
The report supplemented the respondents 2010-08-0616: 23 280+650 ÷1000-(280+650 ÷13).
707 - 35 × 20 ( 120 - 103)× 50
760 ÷ 10 ÷ 38 (95 - 19 × 5 )÷74
45 × 20 × 3 (270 + 180)÷(30 - 15)
3 1.50+ 160÷40 (58+370)÷(64-45)
32. 120- 144÷ 18+35
33.347+45×2-4 160÷52
34 (58+37)÷(64-9×5)
35 .95÷(64-45)
36. 178- 145÷5×6+42 420+580-64×2 1÷28
37.8 12-700÷(9+3 1× 1 1) ( 136+64)×(65-345÷23)
38.85+ 14×( 14+208÷26)
39.(284+ 16)×(5 12-8208÷ 18)
40 . 120-36×4÷ 18+35
4 1.(58+37)÷(64-9×5)
42 .(6.8-6.8×0.55)÷8.5
43.0. 12× 4.8÷0. 12×4.8
44. (3.2×1.5+2.5) ÷1.63.2× (1.5+2.5) ÷1.6 Supplementary applicant 201.
49.5.8×(3.87-0. 13)+4.2×3.74
50.32.52-(6+9.728÷3.2)×2.5
2356-( 1356-72 1) 1235-( 1780- 1665) 75×27+ 19×2 5
3 1.50+ 160÷40 (58+370)÷(64-45)
32. 120- 144÷ 18+35
33.347+45×2-4 160÷52
34(58+37)÷(64-9×5)
35.95÷(64-45)
36. 178- 145÷5×6+42 420+580-64×2 1÷28
37.8 12-700÷(9+3 1× 1 1) ( 136+64)×(65-345÷23)
38.85+ 14×( 14+208÷26)
39.(284+ 16)×(5 12-8208÷ 18)
40. 120-36×4÷ 18+35
4 1.(58+37)÷(64-9×5) Report Respondents Supplemented 20 10-08-06 16:26 III. Comparative calculation:
49 + 17 - 25 240 ÷ 40 × 5 300 - 50 × 2
49 - ( 17 + 25) 240 + 40 × 5 300 - 50 × 20 × 0
Four, off-type calculation:
12 1 - 1 1 1 ÷ 37 ( 12 1 - 1 1 1 ÷ 37)× 5
640÷80=
15×5=
23×3=
12×2×5=
480÷80=
16×5=
27×3=
90÷ 15=
48÷4=
640÷ 16=
39÷3=
24×20=
32×3=
48÷ 16=
12×8=
27×3=
56÷ 14= informant supplement 2010-08-0616: 27 24÷ 8 =
14×2=
83-45=
560÷80=
96÷24=
40÷20=
40×30=
37+26=
76-39=
605+59=
30×23=
12×8=
27+32=
48+27=
4500×20=
73+ 15 =
120×600 =
200×360=
6800×400=
280+270=
4×2500=
6000÷40=
5× 1280=
4.3+2.7=
0.75+0.25=
4-0.26=
0.35+2.7=
4.6- 1.9=
0.83-0.3=
3+0.05=
7.2-3.8=
0.07+0.6=
26- 12+24=
22+35+29=
57-38+ 15=
80- 12- 14=
32-27+86=
36+27-48= Supplement to the report respondents 2010-08-0616: 29 65+35-34 =
72-35+26=
86-37+20=
54- 13+37=
39-20+77=
10+56-30=
12+6+50=
66- 10=
13+5 1=
82+5=
75-22=
79+ 14=
80-4=
69- 18=
84-20=
9 1-7 1=
89+0=
1 1+7 1=
10+75=
36+62=
73-45=
64-46=
90-60=
73-20=
93-8 1=
19+44=
55-48=
72+2 1=
50+24=
86-76=
65+35=
76+ 15=
13+ 18=
26+2 1=
100-87=
84-82=
27+ 18= informant's supplement 2010-08-0616: 30 61+34 =
47-6=
47+32=
72-35=
88-3 1=
94+0=
24- 12=
52+20=
75-34=
75-57=
42+45=
74- 17=
67+22=
7 1+23=
76-35=
58-50=
49+26=
89-46=
13+64=
48+43=
5 1+36=
59-39=
17+50=
55- 10=
18+82=
1 1+85=
37+97=
75-5 1=
68-47=
9 1-6 1=
74-29=
94-83=
20+59=
60-50=
73+79=
52+54=
87-78=
67+99=
77+67=
14+29=
27+36=
88+ 1 1=
86-84=
28+33=
62+88=
48- 17=
56+ 16=
48+66=
35+ 13= informant's supplement 20 10-08-06 16:32
75-36=
90-32=
95+ 12=
32- 13=
53+48=
78-36=
78-58=
43+80=
75-26=
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17×40=680 100-63=37 3.2+ 1.68=4.88 2.8×0.4= 1. 12
14-7.4=6.6 1.92÷0.04=48 0.32×500= 160 65+4.35=69.35
10-5.4=4.6 4÷20=0.2 3.5×200=700 1.5-0.06= 1.44
0.75÷ 15=0.05 0.4×0.8=0.32 4×0.25= 1 36+ 1.54=37.54
1.0 1×99=99.99 420÷35= 12 25× 12=300 135÷0.5=270
0.5 1÷ 17=0.03 32.8+ 19=5 1.8 5.2÷ 1.3=4 1.6×0.4=0.64
4.9×0.7=3.43 1÷5=0.2 6÷ 12=0.5 87-0.49=86.5 1
17×40=480 100-63=37 3.2+ 1.68=4.88 2.8×0.4= 1. 12
14-7.4=6.6 1.92÷0.04=48.75 0.32×500= 160 65+4.35=69.35
10-5.4=4.6 4÷20=0.2 3.5×200=700 1.5-0.06= 1.44
0.75÷ 15= 0.4×0.8= 4×0.25= 0.36+54=
1.0 1×99= 5÷35= 25× 12= 135÷0.5=
0.5 1÷ 17= 32.8+ 19= 5.2÷ 1.3= 1.6×0.4=
4.9×0.7= 1÷5= 6÷ 12= 87-0.49=
17×40= 100-63= 3.2+ 1.68= 2.8×0.4=
14-7.4= 1.92÷0.04= 0.32×500= 0.65+35=
10-5.4= 4÷20= 3.5×200= 1.5-0.06=
0.75÷ 15= 0.4×0.8= 4×0.25= 0.3+ 1.54=
1. 1×99= 20÷35= 25× 12= 135÷0.5=
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Hope to adopt!