Oblicz ułamki. /=Kreska ułamkowa
1 2/7+1/4=
1 3/4+3 3/5=
5 2/3-3 2/5=
7 1/8-5 3/4=
15x4 2/3=
1 1/3x3 3/4=
3 3/4:12=
7 1/3:1 4/7=
Daje za to zadanie 10 punktów.
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1 2/7+1/4= 9/7 + 1/4 = 36/28 + 7/28 = 43/28 = 1 15/28
1 3/4+3 3/5= 7/4 + 18/5 = 35/20 + 72/20 = 107/20 = 5 7/20
5 2/3-3 2/5= 17/3 - 17/5 = 85/15 - 51/15 = 34/15 = 2 4/15
7 1/8-5 3/4= 57/8 - 23/4 = 57/8 - 46/8 = 11/8 = 1 3/8
15x4 2/3= 15 x 14/3 = 70 (5 i 3 się skraca)
1 1/3x3 3/4= 4/3 x 15/4 = 15/3 = 5 (czwórki się skracają)
3 3/4:12= 15/4 : 12 = 15 x 1/3 = 5
7 1/3:1 4/7= 22/3 : 11/7 = 22/3 x 7/11 = 2/3 x 7 = 14/3 = 4 2/3 (11 i 22 się skraca)