Question

Add the following rational numbers.​

Answer 1

$\frac{3}{10} + \frac{0.4}{100} + \frac{ - 21}{1000} + \frac{7}{10000} \\ lcm = 10000 \\ \frac{3}{10} + \frac{4}{100 \times 10} + \frac{ - 21}{1000} + \frac{7}{10000} \\ \frac{3 \times 1000 + 4 \times 1 + ( - 21 \times 10) + 7}{10000} \\ \frac{3000 + 4 - 21 + 7}{10000} \\ \frac{2990}{1000} = 2.99$