Yfirlitsæfingar

5815$\frac{58}{15}$

6311$\frac{63}{11}$

1214$12\frac{1}{4}$

945$9\frac{4}{5}$

Finnið þrjú brot sem eru jafngild $\frac{2}{5}.$ Sýnið útreikninga með myndum eða algebru.

Finnið þrjú brot sem eru jafngild $-\frac{4}{3}.$ Sýnið útreikninga með myndum eða algebru.

58,43,334,4$\frac{5}{8},\frac{4}{3},3\frac{3}{4},4$

14,−14,113,−1⁢13,72,−72$\frac{1}{4},-\frac{1}{4},1\frac{1}{3},\mathrm{-1}\frac{1}{3},\frac{7}{2},-\frac{7}{2}$

−1___−25$\mathrm{-1}\_\_\_-\frac{2}{5}$

−2⁢12___−3$\mathrm{-2}\frac{1}{2}\_\_\_\mathrm{-3}$

−6384$-\frac{63}{84}$

−90120$-\frac{90}{120}$

−14⁢𝑎14⁢𝑏$-\frac{14a}{14b}$

−8⁢𝑥8⁢𝑦$-\frac{8x}{8y}$

25·813$\frac{2}{5}·\frac{8}{13}$

−13·127$-\frac{1}{3}·\frac{12}{7}$

29·(−4532)$\frac{2}{9}·\left(-\frac{45}{32}\right)$

6⁢𝑚·411$6m·\frac{4}{11}$

−14⁢(−32)$-\frac{1}{4}\left(\mathrm{-32}\right)$

165·158$\frac{16}{5}·\frac{15}{8}$

29$\frac{2}{9}$

154$\frac{15}{4}$

3$3$

−14$-\frac{1}{4}$

Fyllið út töfluna.

23÷16$\frac{2}{3}÷\frac{1}{6}$

(−3⁢𝑥5)÷(−2⁢𝑦3)$\left(-\frac{3x}{5}\right)÷\left(-\frac{2y}{3}\right)$

45÷3$\frac{4}{5}÷3$

8÷83$8÷\frac{8}{3}$

518÷(−𝑏9)$\frac{5}{18}÷\left(-\frac{b}{9}\right)$

315·178$3\frac{1}{5}·1\frac{7}{8}$

−5⁢712·4411$\mathrm{-5}\frac{7}{12}·4\frac{4}{11}$

8÷223$8÷2\frac{2}{3}$

823÷1112$8\frac{2}{3}÷1\frac{1}{12}$

kvóti talnanna $8$ og $y$

kvóti $V$ og mismunar $h$ og $6$

5845$\frac{\frac{5}{8}}{\frac{4}{5}}$

89−4$\frac{\frac{8}{9}}{\mathrm{-4}}$

𝑛438$\frac{\frac{n}{4}}{\frac{3}{8}}$

−1⁢56−112$\frac{\mathrm{-1}\frac{5}{6}}{-\frac{1}{12}}$

5+165$\frac{5+16}{5}$

8·4−523·12$\frac{8·4-5^2}{3·12}$

8·7+5⁢(8−10)₉·3−6·4$\frac{8·7+5\left(8-10\right)}{9·3-6·4}$

38+28$\frac{3}{8}+\frac{2}{8}$

45+15$\frac{4}{5}+\frac{1}{5}$

25+15$\frac{2}{5}+\frac{1}{5}$

1532+932$\frac{15}{32}+\frac{9}{32}$

𝑥10+710$\frac{x}{10}+\frac{7}{10}$

811−611$\frac{8}{11}-\frac{6}{11}$

1112−512$\frac{11}{12}-\frac{5}{12}$

45−𝑦5$\frac{4}{5}-\frac{y}{5}$

−3130−730$-\frac{31}{30}-\frac{7}{30}$

32−(32)$\frac{3}{2}-\left(\frac{3}{2}\right)$

1115−515−(−215)$\frac{11}{15}-\frac{5}{15}-\left(-\frac{2}{15}\right)$

$\frac{1}{3}$ og $\frac{1}{12}$

$\frac{1}{3}$ og $\frac{4}{5}$

$\frac{8}{15}$ og $\frac{11}{20}$

$\frac{3}{4},\frac{1}{6},$ og $\frac{5}{10}$

$\frac{1}{3}$ og $\frac{1}{5},$ MSN $=15$

$\frac{3}{8}$ og $\frac{5}{6},$ MSN $=24$

$-\frac{9}{16}$ og $\frac{5}{12},$ MSN $=48$

$\frac{1}{3},\frac{3}{4}$ og $\frac{4}{5},$ MSN $=60$

15+23$\frac{1}{5}+\frac{2}{3}$

1112−23$\frac{11}{12}-\frac{2}{3}$

−910−34$-\frac{9}{10}-\frac{3}{4}$

−1136−1120$-\frac{11}{36}-\frac{11}{20}$

−2225+940$-\frac{22}{25}+\frac{9}{40}$

𝑦10−13$\frac{y}{10}-\frac{1}{3}$

25+(−59)$\frac{2}{5}+\left(-\frac{5}{9}\right)$

411÷27⁢𝑑$\frac{4}{11}÷\frac{2}{7d}$

25+(−3⁢𝑛8)⁢(−29⁢𝑛)$\frac{2}{5}+\left(-\frac{3n}{8}\right)\left(-\frac{2}{9n}\right)$

(23)₂(58)₂$\frac{{\left(\frac{2}{3}\right)}^2}{{\left(\frac{5}{8}\right)}^2}$

(1112+38)÷(56−110)$\left(\frac{11}{12}+\frac{3}{8}\right)÷\left(\frac{5}{6}-\frac{1}{10}\right)$

$y-\frac{4}{5}$ þegar

1. ⓐ 𝑦 =−45$y=-\frac{4}{5}$
2. ⓑ 𝑦 =14$y=\frac{1}{4}$

$6m{n}^2$ þegar $m=\frac{3}{4}$ og $n=-\frac{1}{3}$

413+913$4\frac{1}{3}+9\frac{1}{3}$

625+735$6\frac{2}{5}+7\frac{3}{5}$

5811+2411$5\frac{8}{11}+2\frac{4}{11}$

358+378$3\frac{5}{8}+3\frac{7}{8}$

91320−41120$9\frac{13}{20}-4\frac{11}{20}$

2310−1910$2\frac{3}{10}-1\frac{9}{10}$

21112−1712$2\frac{11}{12}-1\frac{7}{12}$

8611−2911$8\frac{6}{11}-2\frac{9}{11}$

𝑥−12=16$x-\frac{1}{2}=\frac{1}{6}$:

1. ⓐ 𝑥 =1$x=1$
2. ⓑ 𝑥 =23$x=\frac{2}{3}$
3. ⓒ 𝑥 =−13$x=-\frac{1}{3}$

𝑦+35=59$y+\frac{3}{5}=\frac{5}{9}$:

1. ⓐ 𝑦 =12$y=\frac{1}{2}$
2. ⓑ 𝑦 =5245$y=\frac{52}{45}$
3. ⓒ 𝑦 =−245$y=-\frac{2}{45}$

𝑛+911=411$n+\frac{9}{11}=\frac{4}{11}$

𝑥−16=76$x-\frac{1}{6}=\frac{7}{6}$

ℎ−(−78)=−25$h-\left(-\frac{7}{8}\right)=-\frac{2}{5}$

𝑥5=−10$\frac{x}{5}=\mathrm{-10}$

−𝑧=23$-z=23$

Summa tveggja þriðju hluta og $n$ er $-\frac{3}{5}.$

Mismunur $q$ og eins tíunda hluta er $\frac{1}{2}.$

Kvóti $p$ og $\mathrm{-4}$ er $\mathrm{-8}.$

Þrír áttundu hlutar af $y$ eru $24.$