文档介绍：口算
28 +20= 58 – 6= 66 – 60= 75 – 30= 38 + 40 = 71 + 23 =
89 – 8= 50 + 24= 4 + 55= 96 – 20= 66 – 60= 38 + 21=
30 + 34= 69 – 7= 59 – 4= 73 – 70= 95 – 50= 25 + 44=
62 + 7= 30 + 49= 86 – 60 = 91 – 50= 36 + 30= 51 + 25=
33 + 42= 11 + 13= 15 +23= 35 – 28= 50 – 38= 56 +21=
27 + 19= 57 – 8= 67 – 41= 28 + 15= 95 – 35= 51+46=
7×8= 6×5= 6×3= 8×2= 3×8= 4×4=
9 + 57= 73 – 30= 19 + 48= 68 – 18= 29 – 14 = 37 + 21=
78-5= 80-17= 67-14= 96-13= 75-14= 58-12=
42+15= 15+13= 35+21= 5+18= 17+19= 15+18=
17+39= 25+18= 70-20= 73-3= 58-50= 45-30=
35+18= 17+79= 17+59= 74+18= 45+39= 64+17=
55+36= 27+25= 52+48= 74+17= 58+25= 74+17=
3×6= 2×6= 1×8= 4×6= 2×9= 6×9=
3×7= 42-13= 48+4= 40-6= 45-24= 8×4=
38-29= 36-24= 47-28= 77-37= 4×9= 6×7=
73-12= 36+14= 14+40= 58+15= 5×7= 3×9=
78-37= 4×8= 6×5= 6×5= 8×3= 3×5=
7×7= 5×7= 8×8= 6×7= 7×8= 4×7=
54+23= 46-25= 42+33= 57-35= 37-19= 38+19=
43-15= 44-12= 65-48= 17+23= 64+36= 64-45=
91-65= 65-22= 91-12= 45-15= 37+45= 48+24=
69+30= 38+27= 99-48= 61-33= 90-56= 59-31=
3 +( )=73 5 +( )=70 4 +( )=17
43 +( )=93 38 –( )=8 68 –( )=48
( )– 6 = 50 ( )+ 20 = 66 48 =( )+20
63=( )+13 72=( )+ 70 59=( )+ 9
18+9 – 9 = 12 – 8 + 70 = 70 – 30 + 6 = 46 + 40 + 2 =
99 – 9 – 40 = 5 + 70 – 5 = 9 + 7 + 20 = 14 – 5 + 30 =
30 + 6 + 4 = 55 – 5 + 15 = 36 +30 +20= 5 + 5 5 +20=
13 – 5 + 50= 82 – 80 +8= 5×4+5= 3×6–3=
6×5+6= 3×4+2= 4×6+2= 6×2+4=
3×5-1= 4×5-3= 6×3