Exemplar exercise problems III — task. Mathematics CBSE, Class 8.

UPSKILL MATH PLUS

Learn Mathematics through our AI based learning portal with the support of our Academic Experts!

1.

$-\frac{3}{8} + \frac{(1)}{7} = \frac{(1)}{7} + \left(\frac{-3}{8}\right)$ is an example to show that

addition of rational numbers is associative.
rational numbers are not closed under addition.
rational numbers are distributive under addition.
addition of rational numbers is commutative.

2. Which of the following expressions shows that rational numbers are associative under multiplicaion?

$\frac{2}{3} \times \left(\frac{-6}{7} \times \frac{3}{5}\right) = \frac{2}{3} \times \left(\frac{3}{5} \times \frac{-6}{7}\right)$
$\frac{2}{3} \times \left(\frac{-6}{7} \times \frac{3}{5}\right) = \left(\frac{2}{3} \times \frac{-6}{7}\right) \times \frac{3}{5}$
$\left(\frac{2}{3} \times \frac{-6}{7}\right) \times \frac{3}{5} = \left(\frac{-6}{7} \times \frac{2}{3}\right) \times \frac{3}{5}$
$\frac{2}{3} \times \left(\frac{-6}{7} \times \frac{3}{5}\right) = \left(\frac{3}{5} \times \frac{2}{3}\right) \times \frac{-6}{7}$

Login or Fast registration

Previous exercise

Exit to the topic

Did you find an error?

Register for free to see more content

Register for free to see more content