算一算,比一比.
|
(1)50 +4= |
(2)60 +2= |
|
50 +40= |
60 +20= |
|
(3)40 +3= |
(4)70 +2= |
|
40 +30= |
70 +20= |
推算.
|
(1)56 +4= |
(2)63 +7= |
(3)78 +2= |
|
(4)86 +4= |
(5)93 +7= |
(6)98 +2= |
|
(1)7 -4=____ |
70 -40=_____ |
|
(2)8 -5=____ |
80 -50=_____ |
|
(3)9 -7=____ |
90 -70=_____ |
|
(4)6 -4=____ |
60 -40=_____ |
|
(5)8 -3=____ |
80 -30=_____ |