1. CALCULE.
3-2= ____ 30-20= ____ 4-3= ____
40-30= ___ 5-3= ____
6-3= ___ 60-30= ____ 7-3= ____
70-30= ___ 4-1= ___
4-2= ____ 40-20= ___ 4-3= ____
40-30=___ 5-4= ____
6-4= ___ 60-40=___ 5-1=___
50-10= ___ 5-2= ____
5-3= ____ 50-30=___ 5-4= ___
50-40= ___ 6-1= ____
6-2= ____ 60-20= ____ 6-3= ____
60-30= ___ 6-4= ___
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