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OPERATII CU FRACTII ZECIMALE FINITE

OPERATII CU FRACTII ZECIMALE FINITE. Profesor FLORESCU NICOLAE. Adunarea si scaderea fractiilor zecimale finite se poate face fara a fi nevoiti sa le transformam in fractii ordinare.

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OPERATII CU FRACTII ZECIMALE FINITE

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  1. OPERATII CU FRACTII ZECIMALE FINITE Profesor FLORESCU NICOLAE

  2. Adunarea si scaderea fractiilor zecimale finite se poate face fara a fi nevoiti sa le transformam in fractii ordinare. • La adunarea si scaderea fractiilor zecimale finite, numerele trebuie asezate respectandu-se ordinal fiecarei cifre. Ex:

  3. La inmultirea unei fractii zecimale finite cu 10, 100, 1000 se deplaseaza virgula peste 1, 2 , 3 cifre catre dreapta. Ex: 0,3 ∙ 10 = 3 0,3 ∙ 100 = 30 0,75 ∙ 10 = 7,5 0,75 ∙ 100 = 75 2,73 ∙ 10 = 27,3 2,73 ∙ 100 = 273

  4. La impartirea unei fractii zecimale finite cu 10, 100, 1000 mutam virgula peste 1, 2, 3 cifre catre dreapta. • Exemplu: 2,75 : 10 = 0,275 2,75 : 100 = 0,0275 525: 10 = 52,5 525 : 100 = 5,25 31,4: 10 = 3,14 31,4 : 100 = 0,314

  5. La inmultirea fractiilor zecimale finite, efectuam inmultirea obisnuita, punem virgula de la dreapta spre stanga peste un numar de cifre egal cu numarul cifrelor zecimale ale celor doi factori. Ex:

  6. La impartireauneifractiizecimale la un numar natural, punemvirgula la cat in momentul in care trebuiesacoboram prima zecimala. Ex: 468, 49 : 11 = 42, 59 1802,3 : 134 = 13,45 4606,5 : 1245 = 3,7

  7. Si acumsavedem cum atiinteles…

  8. Completati tabelele de mai jos: 1.

  9. 2. 3.

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