回到整十数.
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(1)23 -( )=20 |
(2)78 -( )=70 |
|
(3)31 -( )=30 |
(4)86 -( )=80 |
|
(5)59 -( )=50 |
(6)98 -( )=90 |
找邻数.
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(1)45 -1= |
(2)51 -1= |
(3)27 +1= |
(4)99 +1= |
|
45 +1= |
51 +1= |
27 -1= |
99 -1= |
分一分,算一算.
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(1)6 +5= |
(2)5 +7= |
(3)7 +6= |
(4)8 +7= |
|
(5)9 +6= |
(6)6 +8= |
(7)8 +5= |
用圆片先摆一摆,再算一算.
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(1)9 +6=_________ |
(2)9 +7=_________ |
(3)9 +8=_________ |
(4)9 +9=_________ |