Odpowiedź:
zad. 5
sposób Doroty:
4*3 5/7 = 4*3+4*5/7 = 12+2 6/7 = 14 6/7
sposób Magdy:
4*3 5/7 = 4* 22/7 = 88/7 = 14 6/7
zad. 6
a) 3*6 2/3 = 3* 20/3 = 60/3 = 20
b) 7*2 1/5 = 7* 11/5 = 77/5 = 15 2/5
c) 1 5/7*3 = 12/7*3 = 36/7 = 5 1/7
d) 5 1/3*10 = 16/3*10 = 160/3 = 53 1/3
zad.7
1 1/3 l*7 = 7l+ 1/3l*7 = 7l+ 7/3l = 7l+2 1/3 l= 9 1/3 l
odp. Babca Jaga przygotowała 9 1/3l konfitur malinowych.
zad.8
b) 4/5*15 = (4*15)/5 = (4*3)/1 = 12/1 = 12
c) 24*2/3 = (24*2)/3 = (8*2)/1 = 16/1 = 16
d) 4*3 7/8 = 12 + (3*7)/8 = 12+21/8 = 12+2 5/8 = 14 5/8
e) 3*2 5/6 = 6+(3*5)/6 = (1*5)/2 = 5/2 = 2 1/2
f) 8*4 4/3 = 32+(8*4)/3 = 32+32/3 = 32+ 10 2/3 = 42 2/3
_ _ _ _ _ _ _ _ _ _ (teraz zadania z drugiego zdjęcia)
zad.1
a) 1. zamaluj 3 koraliki
1/5 liczby 15 to 3
2. zamaluj 6 koralików
2/5 liczby 15 to 6
3. zamaluj 9 koralików
3/5 liczby 15 to 9
b) 1/5*15 = 15/5 = 3/1 = 3
2/5*15 = 30/5 = 6/1 = 6
3/5*15 = 45/5 = 9/1 = 9
zad.2
zamaluj koraliki (5 niebieskich, 4 żółte i 8 czerwonych)
1/3 z 18 guzików to 6 guzików || 1/3*18 = 18/3 = 6/1 = 6
2/9 z 18 guzików to 4 guziki || 2/9*18 = 36/9 = 4/1 = 4
4/9 z 18 guzików to 8 guzików || 4/9*18 = 72/9 = 8/1 = 8
zad.3
a) 1/5 kwoty 40 zł = 8zł || 1/5*40zł = 40/5 = 8/1 = 8zł
b) 1/3 kwoty 21zł = 7zł || 1/3*21zł = 21/3zł = 7/1 = 7zł
c) 1/4 m = 25cm || 1/4*100cm = 100/4cm = 25/1cm = 25cm
d) 3/4 godziny to 45 minut || 3/4*60 = 180/4 = 45/1 = 45 minut
e) 1 3/4 t to 1750kg || 1 3/4*1000 = 1750/1 = 1750
Szczegółowe wyjaśnienie:
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