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\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{23}\\{67}\end{array}}\\\hline{\,\,\,90}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{46}\\{18}\end{array}}\\\hline{\,\,\,64}\end{array}\)
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{59}\\{21}\end{array}}\\\hline{\,\,\,80}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{64}\\{19}\end{array}}\\\hline{\,\,\,83}\end{array}\)
`@` `\text {Ans}`
`\downarrow`
`e)`
`1+(-4)+7+(-10)+13`
`= (-4 - 10) + (1 + 13) + 7`
`= -14+14 + 7`
`= 7`
`f)`
`-2+7+(-12)+17+(-22)`
`= (7 + 17) + (-12 - 22) - 2`
`= 24 - 34 - 2`
`= -10 - 2`
`= -12`
`g)`
`44+45+46+47-24-25-26-27`
`= (44 - 24) + (45 - 25) + (46 - 26) + (47 - 27)`
`= 20 + 20 + 20 + 20`
`= 20*4 = 80`
\(\begin{array}{*{20}{c}}{a)\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{25}\\{39}\end{array}}\\\hline{\,\,\,64}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{46}\\{46}\end{array}}\\\hline{\,\,\,92}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{64}\\{26}\end{array}}\\\hline{\,\,\,90}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{75}\\{15}\end{array}}\\\hline{\,\,\,90}\end{array}\)
\(\begin{array}{*{20}{c}}{b)\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{17}\\{\,7}\end{array}}\\\hline{\,\,\,24}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{89}\\{\,\,2}\end{array}}\\\hline{\,\,\,91}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{58}\\{\,\,\,2}\end{array}}\\\hline{\,\,\,60}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{67}\\{\,\,3}\end{array}}\\\hline{\,\,\,70}\end{array}\)