Ajutati-ma la exercitiile 4,6,7 !!! VA ROG !!DAU CORONA !!

4)1/3 din ora(60 min)=60min:3x1=20min x1=20min
1/6 din ora(60min)=60min:6x1=10min x1=10min
1/60 din ora(60min)=60min:60x1=1min x 1=10min
15/60din ora(60min)=60min:60x15=1min x15=15min
30/60din ora(60min)=60min:60x3=1min x 30=30min

6)1/2 din km(1000 m)=1000m:2x1=500m x 1=500m
3/4 din km(1000 m)=1000m:4x3= 250x3=750m
2/5din km (1000 m)=1000m:5x2=200m x 2=400m
3/10din km (1000m)=1000m:10x3=100m x 3=300m

7)1/4din zi(24 ore)=24:4x1=6x1=6ore
1/2din zi(24 ore)=24:2x1=12x1=12ore
2/6din zi(24 ore)=24:6x2=4x2=8ore
5/10din zi(24 ore) nu se poate pentru ca atunci cand impartim la 10 ne da 2, rest 4.

4)
1/3h=20 min, 
1/6h=10 min,
1/60=1 min,
15/60=15 min,
 30/60=30 min   
 1h=60 min   

5)
60:2=30,        60:4=15,     60:3=20,      60:5=12,    60:10=6
180:2=90,     180:4=45,   180:3=60,   180:5=36,   180:10=18
480:2=240,   480:4=120, 480:3=160,  480:5=96    480:10=48
840:2=420,   840:4=210,  840:3=280,  840:5=168   840:10=84

6)
1/2=0.5m=0.005km
3/4=0.45m=0.045km
2/5=0.4m=0.004km
3/10=0.3m=0.003km

7)
24x1/4=6ore
24x1/2=12 ore
24x2/6=8 ore