Question

EX 1 Dintr-o bucata de sfoara lunga de 5 hm s-au taiat de 4 ori cate 500 dm, iar restul a fost impartit in bucati de cate 30 m. Cate bucati de 30 m s-au obtinut ? EX 2 .Calculeaza ; a) 6 dam + 23 = ?m , 12 km + 15 dam = ?m , 12 hm +63 dam = ?m, 19 hm +55 dam =?m , 192 m + 208 m = ?dam, 20 dm + 32 cm = ? mm b) 64 km - 22 dam = ?m, 750 cm - 120 mm = ?mm, 32 km - 21 dam = ?dam, 1 m - 15 cm = ?cm, 650 m - 1500 dm = ?cm, 8 km - 8 hm = ?dam .
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Answer 1

EX. 1
Dintr-o bucata de sfoara lunga de 5 hm s-au taiat de 4 ori cate 500 dm, iar restul a fost impartit in bucati de cate 30 m. Cate bucati de 30 m s-au obtinut ?

5 hm = 500 m
500 dm= 50 m
500 m - 4 ×50 m = 500 m - 200 m = 300 m (restul)
300 m : 30 m = 10 (bucati de 30 m s-au obtinut)



EX 2.
Calculeaza :
a) 6 dam + 23 hm = ?m
6 dam=60 m
23 hm=2 300 m
60 m + 2 300 m = 2 360 m


12 km + 15 dam = ?m
12 km=12 000 m
15 dam = 150 m
12 000 m + 150 m = 12 150 m


12 hm +63 dam = ?m
12 hm=1 200 m
63 dam=630 m
1 200 m + 630 m = 1 830 m


19 hm +55 dam =?m
19 hm=1 900 m
55 dam=550 m
1 900 m + 550 m = 2 450 m


192 m + 208 m = ?dam
192 m = 19,2 dam
208 m = 20,8 dam
19,2 dam + 20,8 dam = 40 dam


20 dm + 32 cm = ? mm
20 dm=2 000 mm
32 cm = 320 mm
2 000 mm + 320 mm = 2 320 mm


b) 64 km - 22 dam = ?m
64 km = 64 000 m
22 dam=220 m
64 000 m - 220 m = 63 780 m


750 cm - 120 mm = ?mm
750 cm =7 500 mm
7 500 mm - 120 mm = 7 380 mm


32 km - 21 dam = ?dam
32 km = 3 200 dam
3 209 dam - 21 dam = 3 188 dam


1 m - 15 cm = ?cm
1 m = 100 cm
100 cm - 15 cm = 85 cm


650 m - 1500 dm = ?cm
650 m = 65 000 cm
1 500 dm = 15 000 cm
65 000 cm - 15 000 cm = 50 000 cm


8 km - 8 hm = ?dam
8 km = 800 dam
8 hm=80 dam
800 dam - 80 dam = 720 dam