Brøk – addisjon og subtraksjon 1: Spor I – fasit

SPOR I

Oppgave 1

a) $\frac{2}{4}+\frac{1}{4}=\frac{3}{4}$	b) $\frac{2}{7}+\frac{1}{7}=\frac{3}{7}$	c) $\frac{1}{8}+\frac{3}{8}=\frac{4}{8}=\frac{1}{2}$
d) $\frac{4}{5}-\frac{2}{5}=\frac{2}{5}$	e) $\frac{5}{6}-\frac{1}{6}=\frac{4}{6}=\frac{2}{3}$	f) $\frac{3}{4}-\frac{1}{4}=\frac{2}{4}=\frac{1}{2}$
g) $\frac{1}{5}+\frac{2}{5}+\frac{1}{5}=\frac{4}{5}$	h) $\frac{1}{6}+\frac{2}{6}+\frac{3}{6}=\frac{6}{6}=1$	i) $\frac{3}{10}+\frac{1}{10}+\frac{4}{10}=\frac{8}{10}=\frac{4}{5}$
j) $\frac{1}{3}+\frac{4}{3}-\frac{2}{3}=\frac{3}{3}=1$	k) $\frac{3}{10}-\frac{1}{10}+\frac{3}{10}=\frac{5}{10}=\frac{1}{2}$	l) $\frac{5}{6}-\frac{1}{6}-\frac{2}{6}=\frac{2}{6}=\frac{1}{3}$

Oppgave 2

a) $\frac{3}{4}$

b) $\frac{1}{4}$

c) $\frac{4}{4}=1$

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