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Scrie toate nr nat de două cifre care au suma cifrelor:a)2,b)4,c)6,d)8

Răspuns :

[tex]a)11,20.[/tex]

[tex]1 + 1 = 2[/tex]

[tex]2 + 0 = 2[/tex]

[tex]b)13,22,31,40.[/tex]

[tex]1 + 3 = 4[/tex]

[tex]2 + 2 = 4[/tex]

[tex]3 + 1 = 4[/tex]

[tex]4 + 0 = 4[/tex]

[tex]c)15,24,33,42,51,60.[/tex]

[tex]1 + 5 = 6[/tex]

[tex]2 + 4 = 6[/tex]

[tex]3 + 3 = 6[/tex]

[tex]4 + 2 = 6[/tex]

[tex]5 + 1 = 6[/tex]

[tex]6 + 0 = 6[/tex]

[tex]d)17,26,35,44,53,62,71,80.[/tex]

[tex]1 + 7 = 8[/tex]

[tex]2 + 6 = 8[/tex]

[tex]3 + 5 = 8[/tex]

[tex]4 + 4 = 8[/tex]

[tex]5 + 3 = 8[/tex]

[tex]6 + 2 = 8[/tex]

[tex]7 + 1 = 8[/tex]

[tex]8 + 0 = 8[/tex]