## Task 2

a) $47+a<52 \quad a=\ldots \quad ; \quad 93-b<88 \quad b=\ldots$

b) Solve the following problems! $12+7 \quad 47-5$

c) Compare and explain! $\quad \begin{array}{lllll}63 & 54 & 77 & 85\end{array}$
a) $a=0,1,2,3,4 ; b=0,1,2,3,4$

b) $12+7=19 ; 47-5=42$

c) $63>54$, because $54+9=63 ; 77<85$, because $77+8=85$