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ID number:417432
 
Evaluation:
Published: 01.06.2015.
Language: Latvian
Level: Elementary school
Literature: n/a
References: Not used
Extract

Skaitlis dalās ar 19, ja ar 19 dalās skaitlis, kas iegūts, dotajam skaitlim noņemot pēdējo ciparu un tad pieskaitot noņemto ciparu, pareizinātu ar 2.
Piemērs:
437-dalās ar 19,
jo (43+7x2):19=57:19=3

Skaitlis dalās ar 20, ja tā pēdējo divu ciparu veidotais skaitlis dalās ar 20.
Piemēri:
978 980-dalās ar 20,
jo 80 dalās ar 20.
379 215-nedalās ar 20,
jo 25 nedalās ar 20.

Skaitlis dalās ar 25, ja tā pēdējie divi cipari apzīmē skaitli, kurš dalās ar 25.
Piemēri:
789 375-dalās ar 25, jo 75 dalās ar 25.
9 841 050-dalās ar 25, jo 50 dalās ar 25.
43 264-nedalās ar 25, jo 64 nedalās ar 25.

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