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a)
0,75 h = 60 min * 0,75 = 45 min
1,25 h = 75 min
0,5 h = 30 min
0,2 h = 60 min * 0,2 = 12 min
b)
0,25 min = 15 s
5/6 min = 50 s
1,1 min = 66 s
2.Oblicz
a) 0,6 * 1/4 = 6/10 * 1/4 = 6/40 = 3/20
b)1 1/8 * 0,1 = 9/8 * 1/10 = 9/80
c)3,75 * 4 *0,01 = 0,15
d)5/9 : 1 1/4 = 5/9 * 4/5 = 4/9
e)2 5/6 : 3,4 =17/6 * 10/34 = 1/3 * 5/2 = 5/6
f)0,18 : 2 2/5 = 9/5 * 5/12 = 3/4