$17+22=10+7+20+2=10+20+7+2=30+9=39$

$43+37=40+3+30+7=40+30+3+7=70+10=80$

$54+18=50+4+10+8=50+10+4+8=60+12=72$

 

$74-31=74-30-1=44-1=43$  

$56-26=56-20-6=36-6=30$

$43-39=43-30-9=13-9=4$

 

$4\cdot 7=28$

$6\cdot 10=60$

$8\cdot 8=64$

 

$42:6=7$

$64:8=8$

$90:10=9$

 

liczba	4	64	28	8	39	72	60	80		30	7	9	43
litera	Ż	e	l	a	z	o	w	a		W	o	l	a