DAM NAJ Zamień na: a) sekundy 2.1/3 min 1.3/4 h b)minuty 200 s 25 s 1.1/6 h 2,25 h 3/20 h 1/4 h 2/15 h c)godziny 600 s 240 s 20 min 84 min 12 min 8 min

a) 2 1/3 min = 2 1/3 * 60 = 7/3 * 60 = 7 * 20 = 140 s 1 3/4 h = 1 3/4 * 3600 = 7/4 * 3600 = 7 * 900 = 6300 s b) 200 s = 200 : 60 = 20/6 min = 3 2/6 min = 3 1/3 min 25 s = 25 : 60 = 5/12 min  1 1/6 h = 1 1/6 * 60 = 7/6 * 60 = 7 * 10 = 70 min 2,25h = 2,25 * 60 = 135 min 3/20 h = 3/20 * 60 = 3 * 3 = 9 min 1/4 h = 1/4 * 60 = 15 min 2/15 h = 2/15 * 60 = 2 * 4 = 8 min c) 600 s = 600 : 3600 = 1/6 h 240 s = 240 : 3600 = 1/15 h 20 min= 20 : 60 = 1/3 h 84 min = 84 : 60 = 1 24/60 h = 1 2/5 h 12 min = 12 : 60 = 1/5 h 8 min = 8 : 60 = 2/15 h