16-8=          19-9=          16-6= 

17-9=          16 –9=         17-8=

16-7=          18-8=          18-9=

还剩几个蘑菇？                          

4+{#blank#}1{#/blank#}= 10      9+{#blank#}2{#/blank#}= 18        7-{#blank#}3{#/blank#}= 7

10- {#blank#}4{#/blank#}= 6       {#blank#}5{#/blank#}-4 = 10       15-{#blank#}6{#/blank#}= 11

5-1=        10-2=        18-1=        8+3=

2+4=        6+9=        12-2=        14-1=

7+5=        9+7=        5+8=        9-7=

3+7=        10+3=       10-3=       8+7=