Va prezentam cateva tipuri de exercitii, din lucrarea de mai sus, impreuna cu rezolvarile aferente:
1. Indica vecinii numerelor:
a) __________ 48599 ____________
b) 38589 _________ _____________
c) ________ __________ 635800
d) _________ 156320 ___________
2. Descopera regula si continua sirul cu inca trei numere:
a) 185905, 185909, __________ ___________ ___________
b) 39045, 40045, __________ _____________ __________
c) 896323, 896320, __________ ___________ __________
d) 10001, 12001, ___________ ___________ ___________
3. Reconstituie urmatoarele adunari:
a) 1*5*3*+
*2*1*3
_________
499989
b) 283*** +
***245
________
599897
c) *2**5* +
**41*3
________
889877
d) ***9*0 +
**4*3*
________
599958
4. Scrie A = adevarat sau F = fals, in dreptul urmatoarelor operatii:
a) 573825 – 32891 < 73858 + 62351
b) 62381 + 20 – 5 = 62381 – 5 + 20
c) 1005 + 3008 > 995 + 2009
d) 30109 – 209 > 30000 + 209
5. Incercuieste rezultatul corect:
a) 25 + 18 x 50 = 825, 925, 2150
b) 35 x 15 + 28 x 19 = 1057, 10507, 11507
c) 453 - 216 x 4 = 828, 984, 1317
d) 893 x 0 + 825 x 1= 0, 893, 825
6. Afla cel mai mic numar format din doua cifre identice, care impartit la 5 da restul un numar impar ≥ 1.
7. Calculeaza respectand ordinea operatiilor. Asaza rezultatele in ordine descrescatoare si descopera cuvantul:
a) U [(26 + 15 x 3) – 25 : (81 : 9 – 4)] =
............................................................................................................................................................................................................................. .............................................................................................................................................................................................................................
b) B (25 + 3 x 4) + (426 : 3 + 12) =
............................................................................................................................................................................................................................. .............................................................................................................................................................................................................................
c) N 325 : 5 - (46 + 2 : 2) + 12 =
............................................................................................................................................................................................................................. .............................................................................................................................................................................................................................
8. Suma a 4 numere consecutive pare este 420. Aflati numerele:
10. Efectueaza
a) 5 dam + 60 dm = ………………… m
b) 52 hm + 3200 cm = ……………….. m
c) 85 dam : 50 dm = ………………… m
d) 32 hm x 300 cm = ………………… m
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Claudiu 02 Apr. 2020 11:57:32
Problema nr 8Raspunsul este gresit.
Suna a 4 nr consecutive pare este 420
102 104 106 108