人教版小学二年级下册数学口算练习题[全套]
芬兰大使馆-三峡大学录取分数线
人教版小学二年级下册数学口算练习题［全套］
二年级暑假作业数学口算练习题
(一)
21?7, 15?5, 10?2, 24?3, 12?4, 30?6,
36?6, 42?7, 16?4, 40?5, 63?9,
36?9, 18?3,
27?9, 42?6, 36?4, 24?4, 25?5, 8 ?4, 21?3, 64?8,
14?2, 18?6,
2 ?2, 6 ?2, 12?3, 2 ?1, 8 ?2,
20?5, 4 ?1, 7 ?7, 35?5,
(二)
24?8, 48?8,
14?7, 9 ?3, 28?7, 6 ?3, 12?6, 20?4, 56?7, 16?8,
72?8,
6 ?1, 32?8, 45?9, 24?6, 81?9, 56?8,
45?5, 12?2, 18?9, 10?5, 27?3, 49?7,
18?2,
32?4, 40?8, 4 ?4, 15?3, 28?4, 30?5, 48?6, 9 ?9,
(三)
16?2, 4 ?2, 35?7, 5 ?1, 72?9, 63?7,
54?6, 32?4, 8 ?8, 56?8, 7 ?1,
45?9, 35?7,
30?5, 36?6, 72?8,
- 1 -
1 ?1, 12?3,
10?5, 42?6,
21?3, 14?7, 24?8, 18?3,
16?8, 63?9, 28?7, 15?5,
12?6, 6 ?3, 8 ?4,
20?4,
(四)
48?8, 24?6, 5 ?5, 35?5,
15?5, 12?4, 30?6, 49?7, 21?7, 16?4, 40?5,
54?9, 18?3, 27?9, 42?6,
36?4, 24?4, 8 ?1,
21?3, 2 ?2,
64?8, 14?2, 18?6, 9 ?1, 2 ?1, 8
?2, 56?8, 28?4,
20?5, 3 ?1, 7 ?7,
25?5,
(五)
48?8, 14?7, 9 ?3, 36?9, 28?7,
6 ?2, 56?7, 72?8, 4 ?1, 3 ?3, 8 ?4,
24?8,
32?8, 45?9, 81?9, 56?8, 45?5, 12?2, 24?3,
10?5, 27?3, 49?7, 18?2,
32?4, 40?8, 4 ?4,
28?4, 30?5, 9 ?9, 16?2, 4 ?2, 35?7,
(六)
- 2 -
5 ?1, 72?9, 63?7, 54?6, 63?9, 18?9,
42?7, 8 ?8,
12?3, 10?2, 6 ?6, 45?5, 36?6, 6
?1, 24?3, 16?8, 12?6, 18?9, 6 ?3,
20?4, 7 ?1,
48?6, 24?6, 5 ?5,
35?5, 30?5, 45?9, 40?8,
15?3, 1 ?1, 24?8, 14?7, 18?2, 81?9, 56?8,
36?9, 12?2, 8 ?4, 72?8, 16?4,
(七)
12-36?9= 12?4×3= 56?8×5= 14?7+68= 58+35?7=
9×4+56= 9×8-15=
2?1+41= 4×2+23= 29+2×7=
42?6+35= 64?8×6= 55+3×9= 75+4×4= 35?7+57=
1×7+88= 22-20?5= 68-7×9= 9×7-32= 32?8-1=
66-6?2= 81-28?7= 54?9+37=
21?3+75= 4×4?2=
16?8-1= 24+12?2= 3×7-12= 50-9×3= 27?9-3= 9?3+63=
83-
9×9=
(八)
38-72?9= (9-2)?7=
(9+0)×6= (51-6)?9= 28?(16-9)= 99-8×4= (5-2)×7=
(9-5)×8= (29+19)?8= 53-32?8= 40?8×3= 35-4×7=
7×(11-6)= 3×(6+3)=
(10-3)×7= (10+8)?9=
72?(4×2)= 5×4-11= 4×(23-17)= 5×7+56=
- 3 -
25?(31-26)= 2×(8-1)= 79+56?7= 2×3+18=
(27-15)?3= 6?1+46= 89-9×9=
27?9-3= (77-14)?7=
9×9-66= 27?9×7= 15?3+69=
(九)
48?(22-16)=
(3+9)?6= 61-5×5= (19+9)?7= (13-7)?3= 4×(11-4)=
17+3×9= 28?7+57= 8?(21-19)= 6×1?3= (4-1)×8=
3×4+58= (51-11)?5=
24+5×6= 8×(11-7)= 3×4+29=
63-24?3= 80-6×8= 65+12?2= 44-21?3=
28?(2+2)=
6×(14-5)= 89+15?3= 56?(3+5)= 27?(19-16)=
28?(11-4)= 24?(2+2)=
49+16?8= 65+2×8= 3×5+38=
(4+23)?3= 31-12?6=
(十)
74+2×9= 42?6×4=
8?1×5= 8×(11-5)= 77+49?7= (7-1)×9= 12?6×9=
8?4+27= 6×(4+5)= 9×(13-5)= 54?(4+5)= 9×4?6=
42?7×6= (38-2)?6=
48+2×9= (19+5)?8= 28+16?4=
45-2×8= 9×7-11= 7×(13-9)= 8?(24-16)= (5-
2)×3=
57+4×7= 9×2+51= 21?(24-17)= 18+21?3= 88+36?9=
92-7×4= 36-18?3=
51-4×9= 15?(5+0)= (5+3)×3=
(十一)
84-9×8= (8+1)×5= (9-5)×4= (9-1)×8=
- 4 -
(2+6)×7= (23+4)?9= 7×1+36= 6?3-2=
3×(11-4)= 72?9-7= 19-35?5=
35?5-7= 49?(13-6)=
70-6×6= 63-4×6= 8×9+11= 8?(20-16)= (51-3)?8=
5×(6-0)= 6×2+39= (41+22)?7= 3×3+19= 72?9+85=
78+2×2= (30-20)?5= (50-
8)?7= 2×3×8= 32-7?1=
5×(12-3)= 6?3×7= (8-5)×9= 6×2+68=
(十二)
8×(18-9)= 54?6×5= 17+12?3= 96-3×7= 15?3×4=
83-8×9= 70-4×9=
24+8?8= (13-6)×5= 77+32?4=
6?2×9= 87+27?9= (12-9)×8= 6×3?2= 14?7×8=
3?(1+2)= 4?(14-10)= 49-6×3= (9-6)×9=
40-5×7= 9×1+83= (4+3)×7=
7×4+64= 18?3×7=
16?(11-9)= 36?6+29= 60-18?9= 7×(2-2)= (29-15)?7=
(18-
9)×5= 5×(11-3)= 15?3?5=
(十三)
72?(16-7)= 9×12?4= 8×5-3= 30?6×4= (21+3)?3=
62-2×7= 49?7+35=
54?9+28= 28+3×2= 82-3×8=
7×(5-5)= 40?5×7= 20?(2+3)= 48?6×5= 2×6?4=
43-10?2= 84-8×2= 42?(2+4)= 33-30?5= 7×(5+4)=
(73-19)?6= 72-15?5= 61-
9×5= 84-45?9= (11-6)×6=
94-9×6= 4×(10-1)= 40?8×3=
- 5 -
(54-0)?9= 20?4×3= (60-12)?8= 9×9-45=
(十四)
24?4+47= 4×2×5= (6+8)?7= 5×5+26= 5×7-24=
12?4×6= 6?(2+1)=
(7+9)?8= 36?(19-13)= 64+24?4=
(23+25)?6= 40?5-5= (36-0)?6= 2×(13-4)=
(6+9)?5= 28?4+43= 11+8×7= 24?(5+1)= 48+24?4=
19+6×7= 27?(10-7)=
15?(2+3)= (6+10)?4=
36?6+34= 24?3+23= (8-1)×6= 9×8+69= 86-6×9=
(6+6)?3= 9×9-12= 78+8×6= 72-20?4=
(十五)
(19+9)?7= (14+2)?8= 72-5×9= (7+2)×3= 5×(13-4)=
48?(9-3)= 9×(17-
8)= 16?4+67= 18?(24-18)=
18?9+48= (44-8)?4= (1+8)×6= 14?(2-0)=
36?(5+4)= (20+5)?5= 17+3×2= (14+16)?6=
38+36?6= 68+21?7= 16?2-8=
49?7×7= (17+1)?6=
90-9×9= 81-27?9= 20?4+77= 26+56?7= 8×(13-8)=
49?7+39= 77-3×5= 28?7×6= (2+16)?3= 5×6-23=
(十六)
(16+19)?5= 21+9×8= 4×(9-0)=
78+3×6= 30?(21-16)= 5×(18?6)=
89+3?1= 4×(5+4)=
25?(22-17)= 24?8×2= 5×8-21= 3×5-7=
- 6 -
5×5+16= 2×9?6= 7×6+21= 3?(3-0)= (2-1)×9=
(33+3)?9= 6×(12-6)=
9×6-5= 4×9+14= (3+9)?6=
54-64?8= 6×3+37= 24?(2+6)= 92-7×5=
(66+15)?9=
45+7?1= (13+17)?6= (5+7)?4= 91-9×8= 81-9×4=
(十七)
5×5-14= (7-1)×4= 27-2×9= 3×5+37=
10?(17-12)= 5?1+18= (37-7)?5=
7×3-4=
32?(18-14)= 42?(5+1)= (5+2)×7= 27?9+69= 3×9=( )
3×( )=9
8?( )=4 5×( )=35 25?( )=5 ( )×5=20 (
)?5=2 ( )×6=12 27?( )=3
2×( )=10 5×( )=40
1×6=( ) 2×3=( ) ( )?9=1 20?( )=5 ( )?2=2 24?( )=3
14?( )=2 5×6=( ) ( )×7=21
(十八)
3×6=(
) ( )?5=4 ( )?4=1 2×7=( ) ( )×7=28 ( )?3=1 (
)×9=45
2×( )=6 2×7=( ) ( )?8=5 ( )×9=27 3×5=(
) 32?( )=4 81?( )=9 45?( )=5
28?( )=4 8×8=( )
14?( )=2 12?( )=4 ( )?6=5 27?( )=3 8×5=( ) ( )?5=9
1×( )=5 7×9=( ) ( )?4=1 18?( )=9 6×7=( ) 6×9=(
) 36?( )=6 ( )×9=63
( )?3=8
- 7 -
(十九)
5×( )=25 ( )?8=2 ( )?6=7 7×7=( )
6×8=( ) ( )×9=36 ( )×5=15
6×( )=18 64?( )=8 (
)×4=32 ( )?1=1 6?( )=3
6×9=( ) 36?( )=4 (
)?9=5 7×( )=28 4×6=( ) ( )×9=45 ( )?5=4
15?(
)=5 ( )?2=3 ( )×5=25 6×( )=48 ( )×9=81
5×8=( ) ( )×7=56 ( )×3=21 16?( )=4 48?(
)=8 ( )?7=3 5×6=( )
( )×3=12
(二十)
9×8=( ) ( )?8=7 12?( )=3 ( )×4=36
7×2=( )
9?( )=1 8?( )=2 ( )?8=7
( )×9=18 30?( )=5 (
)×7=35 25?( )=5 10?( )=2 6×8=( ) 40?( )=8
2×6=( ) 45?( )=5 54-( )=36 8?( )=4 ( )×4=16
5×( )=30 ( )?4=3 ( )×5=10 83+12=( ) ( )×6=30
37-( )=3 36?( )=6
34-16=( ) ( )-44=13 ( )×9=54
8×( )=24 48+47=( )
(二十一)
8×6=( ) 83-27=(
) ( )+22=89 ( )?4=8
45?( )=5 57+13=( ) 22-(
)=13 9×( )=63 8×7=( ) 37+( )=92 ( )?9=1
54-28=( ) 8×( )=16 ( )?4=5 58-( )=29 34+29=( )
64?( )=8 83+( )=97 ( )+31=75 ( )×6=54
- 8
-
91-( )=82 7×( )=21 8?( )=4 52-37=( ) 30?(
)=6 7×5=( ) 56-( )=37
41+19=( ) ( )-12=51 24?(
)=3 8×6=( ) ( )?4=8
(二十二)
4×( )=20 78-(
)=46 ( )?7=9 ( )×9=27
7?( )=1 ( )×8=72 41+(
)=60 64-12=( ) 35?( )=5 54-( )=19 ( )×4=32
(
)?1=2
( )-77=22 ( )×3=12 9×( )=36 97-79=( ) (
)×5=40 ( )?3=8 6×( )=18
76+16=( ) ( )×6=48 (
)?9=6 ( )+67=79 8×( )=16
29+( )=60 7×( )=28
81-( )=66 56?( )=7
( )×7=42 ( )-50=13
7×9=( ) 54-11=( )
(二十三)
8×8=( ) 5×( )=20
32-19=( ) ( )×7=14
72-37=( ) ( )+21=60 (
)×9=63 76-( )=53 87-( )=78 ( )×5=15 18?( )=3
(
)?5=2
6×5=( ) ( )?6=3 84-65=( ) 1+( )=20 (
)×7=35 2×( )=6 9?( )=3
26+69=( ) ( )?7=1 3?(
)=3 18?( )=3 16?( )=4
2×( )=6 4×9=( ) 13-9=
59-35= 46-37= 89-( )=15 ( )-17=6 6+75=
(二十四)
83-25?5= 27+5×1= 7×5+7= 40?8-1=
- 9 -
32-8?2= 40?8×9= 2×6?3= 36+8?1= 8×4+29= 6?1+35=
9×2?6= 21?7+49=
15?5×8= 67+7?1= 64+7×4=
42?7?2= 58+3×2= 87+14?2= 31-10?2= 7+4×9=
63?9×3= 65-16?2= 7×8-21= 77+32?8= 95-6×9=
30?6×7= 5×7+58= 18?9-1=
64?8?4= 9×6-34= 8×8+9=
95-49?7=
(二十五)
16+9×6= 4×9?6= 39+40?8=
72?9×8= 30-3×4= 45-5×9= 9×3+27=
7×7+45=
73-7?1= 8×3+38= 15?5×9= 39-42?7= 5×5-17= 79+40?5=
51-16?4=
63-24?3= 29+30?5= 6?2+30= 12?3?4=
7×8+42= 30?5+77= 98-9×3= 82-4×7=
19+9×2=
67+9×3= 8?4+48= 3×8?4= 25?5×8= 43-9×4= 17+4×9=
2×1-0=
19+2×8=
8?4?2= 24?3+28= 4×5+15=
42?6+77= 45+5= 1?1= 5×5= 72?8= 9?9= 24?8=
14?7= 6?1= 15?3= 3×6?2= 4?2= 6×2= 6?2= 10?5=
70–52= 49?7= 10?2= 54?6=
20?4= 4×9?6= 21?3=
3×6= 9?3= 90-45=
- 10 -
24?4=
15?5= 27?9= 9×9=
(二十六)
72?9= 3×4?2=
36?4= 5?5= 56+41= 56?7= 16?2= 42?6= 18?2= 5×1=
45-39=
3×6?3= 24?6= 56?7= 36?6= 24?3= 4×5=
27?3= 8?4= 56?8= 45?5= 6?6= 12?6=
1×4= 18?6=
1×8= 24?8= 36?6= 48?6= 4×6?8= 54?6= 7?7=
(二十七)
5?1= 1×6= 56?8= 21?7= 28?7= 7×3=
35?7= 2×3?6= 42?7= 45?9= 30?6=
49?7= 9×2=
56?7= 64?8= 24?6= 63?7= 8×5-8= 4×3= 16?8= 72?8=
2×7= 9?9=
27?9= 5×7= 18?9= 8×3= 81?9?3= 72?9=
81?9= 9?1= 18?9=
(二十八)
1×1= 42?6= 24?8=
36?4= 63?7= 19?2×4= 2×5= 54?6= 2×8= 20?4= 4×7=
49?7=
- 11 -
10?2= 30?6= 3×7=
3×8+40= 45?9= 9×4= 5×6= 6×2= 32?8= 1×5= 48?8=
2×7= 4×8= 2×6?4= 7×6= 12?2= 4×9= 12?4= 5×8=
6?3=
(二十九)
7×9= 63?7= 32?8= 40?8×5= 2?1=
5×3= 2×6= 64?8= 3×3= 5×4= 3×2=
16?8= 23+17=
16?2?4= 42?6= 1×9= 54?9= 6×3= 3×1= 9×6= 6×4= 4×4=
6×5= 27?9×7= 8×1= 54?6= 7?1= 8×8= 63?7= 8×9=
8×5= 40?8=
(三十)
9×3= 54?9×3= 6×9= 30?6=
7×3= 9×9= 16?4= 7×7= 28?7= 40?8= 6×6=
63?9×4=
7×4= 9?1= 7×8= 24?6= 7×5= 24?3= 81?9= 3×6= 25+41=
56?7×6=
14?2= 35?7= 63+24= 9×2= 36?6= 9×5=
35?7= 27?3= 4?4= 56?8×9=
- 12 -
(三十一)
36?9= 42?7= 12?3= 5×9= 20?4= 5×7=
9×8= 18?3= 8?1= 1×6×8= 9?9=
16?2= 71-68= 6?1=
15?3= 9×3= 45+45= 5×9= 66+26= 5×5+52= 72?8= 9×8=
52+35= 8?4= 14?2= 6×2= 6?2= 49?7= 10?2=
54?6×4= 27?9= 20?4=
(三十二)
3×6= 30?6=
15?5= 49?7= 9×4= 9?3= 9×7= 42?6×6= 24?4= 18?9=
9×9=
72?9= 2×2= 30?6= 14?2= 7×8= 35?5= 5×6+41=
80-46= 10?5= 42?6= 7×2=
18?2= 65+26=
5×6=
36?9= 6×4= 54?6?3= 8?8= 4×8= 75-64= 2×1=
(三十三)
32?4= 85-62= 20?5= 6×5= 40?5?2=
16?8= 50+40= 21?3= 5×8= 28?7=
5×4= 24?8= 6×7=
35?5= 4×9?6= 21?7= 3×8= 8?2= 4×8= 30?5= 18?3= 5×2=
48?6= 42+36=
- 13 -
8?1?4= 25?5=
63?9= 28?4= 5×5= 81?9= 3×6= 25+41=
(三十四)
14?7= 4×3= 90-65= 4×5= 41+25= 4×7= 35?7= 4×9=
36+24= 12?2= 78-
19= 3×8= 12?4+9= 24,6×3=
4×8,5= 27?3+6= 56?7,3= 49?9+7= 4×3?2=
6?3×7=
8?4×3= 6×5+37= 12?4+18= 16?4×8= 8?4+48= 25?5+36=
6×8—42=
2×8?4= 8×9?9= 36?6?3= 9?9×6= 42?7×6=
(三十五)
96,80+7= 64,40,8= 40,4+20= 7×5,8=
14?7+25= 15?5+8= 8×9,8= 1×2+20=
54?6+33=
15,45?9= 11,40?8= 7+1×8= 4×5+44= 48?8+7= 1800+200=
93,80=
6×5+37= 10,8?1= 3×8?4= 7×6+10=
24×0= 71,7+30= 70,5×9= 8×9+21=
24,6×3= 4×8,5=
27?3+6= 56?7,3= 49?9+7= 4×3?2= 6?3×7= 8?4×3=
(三十六)
6×5+37= 12?4+18= 16?4×8= 8?4+48=
25?5+36= 6×8—42= 2×8?4=
8×9?9=
- 14 -
36?6?3= 9?9×6= 42?7×6= 96,80+7= 64,40,8=
40,4+20= 7×5,8= 14?7+25=
15?5+8= 8×9,8=
1×2+20= 93,80= 6×5+37= 10,8?1= 7×8= 3×8?4= 7×6+10=
71,7+30= 48?8+7= 70,5×9= 8×9+21= 54?6+33=
510+200= 7+1×8=
(三十七)
8×5,7= 9×3,8=
30?6= 4×5+44= 11,40?8= 4×3?2= 6?3×7= 8?4×3=
6×5+37= 12?4+18= 16?4×8= 8?4+48= 25?5+36=
6×8—42= 2×8?4= 8×9?9=
36?6?3= 9?9×6= 42?7×6=
96,80+7= 64,40,8= 40,4+20= 7×5,8= 14?7+25=
15?5+8= 8×9,8= 1×2+20= 54?6+33= 15,45?9=
11,40?8= 7+1×8= 8×5,7=
(三十八)
9×3,8=
4×5+44= 48?8+7= 1800+200=
6×5+37= 10,8?1=
3×8?4= 7×6+10= 4900,1800= 430+1000= 98，26×0=
80×5= 6000+4000= 5000—500= 8600—600= 1300—500=
15+5×3= 380+50=
789，0= 300?5= 15×4，8= 680×0=
40×25= 6×6+6= 436,24= 111×9= 120×3=
360+80=
300×7= 85+247= 310×3= 630?9=
- 15 -
(三十九)
350?7= 700×2= 18×4= 320×3= 60×15=
72?6?2= 400×3= 8，2×20=
7×8,7= 380,190= 400×6=
35×0= 300×6= 7，3×4= 8×6，7= 522+23=
6×4?2= 120×4= 80×5= 40×5= 15×5，5=
600,50= 56×2= 200,36= 15+5×3=
380+50= 789，0=
300?5= 15×4，8= 680×0= 40×25= 6×6+6=
436,24=
111×9= 120×3= 360+80= 300×7= 85+247= 310×3= 200×5=
320×2= 660?6= 700×2= 80×3= 630?9= 350?7= 18×4=
320×3= 60×15=
72?6?2= 400×3= 8，2×20= 22，40=
7×8,7= 380,190= 400×6= 35×0= 40×6=
300×6=
7，3×4= 8×6，7= 522+23= 6×4?2= 120×4=
(四十)
40×5= 15×5，5= 600,50= 56×2= 200,36= 15+5×3=
380+50= 789，0=
300?5= 15×4，8= 680×0= 40×25=
436,24= 111×9= 120×3= 360+80=
- 16 -
300×7= 85+247= 310×3= 75+21= 69—57= 49+37=
81—25= 25×3=
268+125= 280+40= 46×20= 85,42=
60×9= 55，41= 30×4= 581，12=
(四十一)
400×5=
45?3= 51，31= 13×3= 60?4= 64×10= 6，6×7= 400×5=
425×0=
528,0= 450，80= 57，140= 800×2= 3000,400=
420?7= 6×80，20= 420,330=
5×28= 60×5= 17×3=
212，88= 5600,5000= 77?7= 60,6= 44+49= 99?9=
8800,80= 9600,6000= 800,60= 64+26= 180?9,18=
24?4=
(四十二)
45+4×5= 56?8?7= 49?7?7=
49,9+30= 40?5×6= 40+6×7= 6×7?6=
72,20+10=
9×6?9= 55+10,8= 29+4,20= 63?7?9= 8+27+2= 46+8+4=
42?7×6=
6×5?6= 4×2×9= (21+6)?9= (7+23)?6=
36?6= 24,6×3= 4×8,5= 27?3+6=
56?7,3= 49?9+7=
4×3?2= 6?3×7= 8?4×3= 6×5+37= 12?4+18= 16?4×8=
8?4+48=
(四十三)
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25?5+36= 6×8—42= 2×8?4= 8×9?9= 36?6?3= 9?9×6=
42?7×6= 96,80+7=
64,40,8= 40,4+20= 7×5,8=
14?7+25= 15?5+8= 8×9,8= 1×2+20= 54?6+33=
510+200= 15,45?9= 11,40?8= 7+1×8= 8×5,7=
9×3,8= 4×5+44= 48?8+7=
1800+200= 93,80=
6×5+37= 10,8?1= 24,6×3= 4×8,5= 27?3+6= 56?7,3=
(四十四)
49?9+7= 4×3?2= 6?3×7= 8?4×3=
6×5+37= 12?4+18= 16?4×8= 8?4+48=
25?5+36=
6×8—42= 2×8?4= 8×9?9= 36?6?3= 9?9×6= 42?7×6=
96,80+7=
64,40,8= 40,4+20= 7×5,8= 14?7+25=
15?5+8= 8×9,8= 6×5+37= 10,8?1=
3×8?4= 7×6+10=
72?8= 71,7+30= 48?8+7= 70,5×9= 8×9+21= 54?6+33=
8×5,7= 9×3,8= 30?6= 4×5+44= 11,40?8= 24,6×3=
4×8,5= 27?3+6=
(四十五)
56?7,3= 49?9+7=
4×3?2= 6?3×7= 8?4×3= 6×5+37= 12?4+18= 16?4×8=
8?4+48= 25?5+36= 6×8—42= 2×8?4=
- 18 -
8×9?9= 36?6?3= 9?9×6= 42?7×6= 96,80+7=
64,40,8= 40,4+20= 7×5,8=
14?7+25= 15?5+8=
8×9,8= 1×2+20= 54?6+33= 510+200= 15,45?9= 11,40?8=
7+1×8= 130+80= 46,8= 8×5,7=
- 19 -