Question

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Answer 1

7)10+5+1+1+1+1+1=20
10+10=20
5+10+5=20
5+5+5+1+1+1+1+1=20


8)a)
756 km........... X ore
42km................1 ora

42x=756
X=756/42
X=18 ore

756:42=18
42
336
336
===

B)
756km......x ore
36 km....... 1 ora
36x=756
X=756/36
X=21 ore

756:36=21
72
=36
..36
...==


9)a)
5 zile si 16 ore+8 zile si 6 ore=?ore
1 zi=24 ore
5x24ore+16ore=120+16=136 ore
8x24ore+6ore=192+6=198 ore

136+198=334 ore


B) 9 ore si 50 min+12 ore si 48 min=? Minute
1 ora=60 min
9x60min+50min=540+50=590min
12x60min+48min=720+48=768min

590+768=1358 min


C) 10 ore 0min 45 sec+2ore 10min 15sec=? Sec
1 ora=60min=3600sec

10orex3600sec+0min x60sec+45sec=36000+0+45=36045 sec

2 ore x3600sec+10minx60sec+15sec=7200+600+15=7815 sec

36045+7815=43860 sec



D) 8 ore 30 min 26 sec-5ore 14 min20 sec=? Sec


8orex3600sec+30minx60sec+26sec=28800+1800+26=30626 sec


5ore x 3600sec+14 min x60sec+20sec=18000+840+20=18860 sec

30626-18860=11766 sec



10)
$\frac{1}{4} \times 120 = 1 \times 30 = 30km$
30km sunt protejați
30km=?m
30x1000=30000 metri



11)P=2x(L+l)
P=28m
L=4+l

28=2x(4+l+l)
28=8+4l
4l=28-8
l=20/4
l=5m
L=4+5
L=9m