Răspuns:
1. Transformăm în minute:
a) 1 zi 5 ore 47 min = 1 × 24 × 60 min + 5 × 60 min + 47 min = 1 440 min + 300 min + 47 min = 1 787 min
b) 2 zile 3 ore 11 min = 2 × 24 × 60 min + 3 × 60 min + 11 min = 2 880 min + 180 min + 11 min = 3 071 min
c) 15 ore 20 min = 15 × 60 + 20 = 920 min
d) 7 zile 21 ore 1 min = 7 × 24 × 60 + 21 × 60 + 1 = 11 341 min
e) 4 zile 4 ore 4 min = 4 × 24 × 60 + 4 × 60 + 4 = 6 004 min
18. Calculăm:
a) 2 h 45 min +7 h 15 min = 9 h 60 min = 10 h
b) 1 h 35 min + 2 h 15 min = 3 h 50 min
c) 3 h 38 min + 8 h 41 min = 11 h 79 min = 12 h 19 min
d) 14 h 21 min + 16 h 25 min = 30 h 46 min
e) 6 h 19 min + 3 h 31 min = 9 h 50 min
f) 9 h 10 min + 50 min = 9 h 60 min = 10 h
g) 18 h 20 min + 18 h 20 min = 36 h 40 min
h) 13 h 30 min + 16 h 30 min = 29 h 60 min = 30 h
i) 20 h 40 min + 19 h 20 min = 39 h 60 min = 40 h
j) 14 h 15 min + 30 h 17 min = 44 h 32 min
k) 4 h 32 min + 5 h 19 min = 9 h 51 min
l) 21 h 40 min + 10 h 10 min = 31 h 50 min
✍ Reținem:
[tex]\boldsymbol{ \red{1 \ zi = 24 \ h }} , \ \boldsymbol{ \red{1 \ h = 60 \ min }}[/tex]
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