Cálculo Mental

20 exercicios divididos en 4 bloques

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Bloque 1

Fraccións Equivalentes

1. \(\frac{6}{8}=\frac{x}{24}\)

2. \(\frac{x}{4}=\frac{8}{16}\)

3. \(\frac{9}{x}=\frac{18}{4}\)

4. \(\frac{9}{4}=\frac{18}{x}\)

5. \(\frac{5}{5}=\frac{x}{15}\)

Bloque 2

Simplifica a Fracción

6. \(\frac{70}{28}\)

7. \(\frac{75}{42}\)

8. \(\frac{14}{3}\)

9. \(\frac{8}{10}\)

10. \(\frac{4}{20}\)

Bloque 3

Produto e Divisións de Fraccións

11. \(\frac{3}{3}\):\(\frac{9}{9}\)

12. \(\frac{6}{9}\):\(\frac{1}{9}\)

13. \(\frac{2}{3}\)·\(\frac{1}{1}\)

14. \(\frac{5}{2}\)·\(\frac{7}{5}\)

15. \(\frac{4}{3}\)·\(\frac{4}{1}\)

Bloque 4

Produto por Potencias de 10

16. $73,498\cdot 10^{4}$

17. $0,0729: 10^{2}$

18. $0,81143\cdot 10^{2}$

19. $3,1459: 10^{1}$

20. $9,6631\cdot 10^{3}$

Resultados

Bloque 1 Bloque 3
\(\frac{6}{8}=\frac{x}{24}\) \(\Rightarrow\) x=18
\(\frac{x}{4}=\frac{8}{16}\) \(\Rightarrow\) x=2
\(\frac{9}{x}=\frac{18}{4}\) \(\Rightarrow\) x=2
\(\frac{9}{4}=\frac{18}{x}\) \(\Rightarrow\) x=8
\(\frac{5}{5}=\frac{x}{15}\) \(\Rightarrow\) x=15
\(\frac{3}{3}\):\(\frac{9}{9}\)=\(\frac{27}{27}\)=1
\(\frac{6}{9}\):\(\frac{1}{9}\)=\(\frac{54}{9}\)=6
\(\frac{2}{3}\)·\(\frac{1}{1}\)=\(\frac{2}{3}\)
\(\frac{5}{2}\)·\(\frac{7}{5}\)=\(\frac{35}{10}\)=\(\frac{7}{2}\)
\(\frac{4}{3}\)·\(\frac{4}{1}\)=\(\frac{16}{3}\)
Bloque 2 Bloque 4
\(\frac{70}{28}\)=\(\frac{5}{2}\)
\(\frac{75}{42}\)=\(\frac{25}{14}\)
\(\frac{14}{3}\)=\(\frac{14}{3}\)
\(\frac{8}{10}\)=\(\frac{4}{5}\)
\(\frac{4}{20}\)=\(\frac{1}{5}\)
$73,498\cdot 10^{4}$=734980
$0,0729: 10^{2}$=0,000729
$0,81143\cdot 10^{2}$=81,143
$3,1459: 10^{1}$=0,31459
$9,6631\cdot 10^{3}$=9663,1