Question

Add:
(i) $\begin{array}{c}\begin{array}{cccc}-& 3& 6& 5\end{array}\\ \begin{array}{cccc}-& & 8& 7\end{array}\\ \underline{\overline{\begin{array}{cccc}& & & \end{array}}}\end{array}$

(ii)$\begin{array}{c}\begin{array}{cccc}-& & 7& 3\end{array}\\ \begin{array}{cccc}-& 6& 8& 7\end{array}\\ \underline{\overline{\begin{array}{cccc}& & & \end{array}}}\end{array}$

(iii)$\begin{array}{c}\begin{array}{cccc}-& 10& 6& 5\end{array}\\ \begin{array}{cccc}-& 9& 8& 7\end{array}\\ \underline{\overline{\begin{array}{cccc}& & & \end{array}}}\end{array}$

(iv) $\begin{array}{c}\begin{array}{cccc}-& 35& 9& 6\end{array}\\ \begin{array}{cccc}-& 10& 8& 9\end{array}\\ \underline{\overline{\begin{array}{cccc}& & & \end{array}}}\end{array}$

Answer 1

(i)
$\begin{array}{l}-\text{365}\\ \frac{-\text{87}}{-\text{452}}\end{array}$
−365
−365 −87 −365 −87 -365 and -87 are both negative integers. So, we add 365 and 87, and put the negative sign before the sum.

(ii)
$\begin{array}{l}-\text{687}\\ \frac{-\text{73}}{-\text{760}}\end{array}$
-687 and -73 are both negative integers. So, we add 365 and 87, and put the negative sign before the sum.

(iii)
$\begin{array}{l}-\text{1065}\\ \frac{-\text{987}}{-2052}\end{array}$
-1065 and -987 are both negative integers. So, we add 1065 and 987, and put the negative sign before the sum.

(iv)
$\begin{array}{l}-\text{3596}\\ \frac{-\text{1089}}{-4685}\end{array}$
-3596 and -1089 are both negative integers. So, we add 3596 and 1089, and put the negative sign before the sum.