Setze die Zahlenreihen fort!
a) 10, 15, 20, _____, _____, _____, _____, _____, 50
b) 10, 12 , 15, 17, 20, _____, _____, _____, _____, _____, 35
c) 99, 90, 81, _____, _____ , _____, _____, _____, _____, 18
Setze die Zahlenreihen fort!
a) 10, 15, 20, 25, 30, 35, 40, 45, 50
b) 10, 12 , 15, 17, 20, 22, 25, 27, 30, 32, 35
c) 99, 90, 81, 72, 63 , 54, 45, 36, 27, 18