Calculate $3+4-\left(-\frac{4}{5}\right)$3+4−(−45).

Calculate $3+\left(-\frac{5}{6}\times\frac{1}{4}\right)$3+(−56×14), leaving your answer in simplest fraction form.

Calculate $2-5\times\left(-\frac{4}{7}\right)$2−5×(−47), leaving your answer in simplest fraction form.

Evaluate $\frac{-2}{5}\times\frac{4}{5}+\frac{2}{25}$−25×45+225, writing your answer in its simplest form.

Simplify numerical expressions involving integers and rational numbers, with and without the use of technology