# Lerncheck: Brüche und Variablen (Addition)

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Berechne die Wert für x und trage sie ein:

1. Bruchaddition 3/2 + x/2 = 12/2

1.) $$\frac{3}{2} + \frac{x}{2} = \frac{12}{2} \Rightarrow x =$$

2. Bruchaddition 1/4 + x/4 = 12/8

2.) $$\frac{1}{4} + \frac{x}{4} = \frac{12}{8} \Rightarrow x =$$

3. Bruchaddition 1/7 + x/21 = 9/21

3.) $$\frac{1}{7} + \frac{x}{21} = \frac{9}{21} \Rightarrow x =$$

4. Bruchaddition 6/40 + x/20 = 11/5

4.) $$\frac{6}{40} + \frac{x}{20} = \frac{11}{5} \Rightarrow x =$$

5. Bruchaddition 5/14 + 5/x = 20/7

5.) $$\frac{5}{14} + \frac{5}{x} = \frac{20}{7} \Rightarrow x =$$

6. Bruchaddition 1/3 + 5/x = 2/5

6.) $$\frac{1}{3} + \frac{5}{x} = \frac{2}{5} \Rightarrow x =$$

7. Bruchaddition 2/7 + 24/x = 16/14

7.) $$\frac{2}{7} + \frac{24}{x} = \frac{16}{14} \Rightarrow x =$$

8. Bruchaddition 10/6 + 15/x = 30/12

8.) $$\frac{10}{6} + \frac{15}{x} = \frac{30}{12} \Rightarrow x =$$

9. Bruchaddition x/24 + 1/24 = 36/48

9.) $$\frac{x}{24} + \frac{1}{24} = \frac{36}{48} \Rightarrow x =$$

10. Bruchaddition x/5 + 26/10 = 27/5

10.) $$\frac{x}{5} + \frac{26}{10} = \frac{27}{5} \Rightarrow x =$$

11. Bruchaddition x/78 + 5/39 = 72/156

11.) $$\frac{x}{78} + \frac{5}{39} = \frac{72}{156} \Rightarrow x =$$

12. Bruchaddition 5/20 + x/40 = 60/160

12.) $$\frac{5}{20} + \frac{x}{40} = \frac{60}{160} \Rightarrow x =$$