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\begin{array}{l}\phantom{120)}\phantom{1}\\120\overline{)640}\\\end{array}
Use the 1^{st} digit 6 from dividend 640
\begin{array}{l}\phantom{120)}0\phantom{2}\\120\overline{)640}\\\end{array}
Since 6 is less than 120, use the next digit 4 from dividend 640 and add 0 to the quotient
\begin{array}{l}\phantom{120)}0\phantom{3}\\120\overline{)640}\\\end{array}
Use the 2^{nd} digit 4 from dividend 640
\begin{array}{l}\phantom{120)}00\phantom{4}\\120\overline{)640}\\\end{array}
Since 64 is less than 120, use the next digit 0 from dividend 640 and add 0 to the quotient
\begin{array}{l}\phantom{120)}00\phantom{5}\\120\overline{)640}\\\end{array}
Use the 3^{rd} digit 0 from dividend 640
\begin{array}{l}\phantom{120)}005\phantom{6}\\120\overline{)640}\\\phantom{120)}\underline{\phantom{}600\phantom{}}\\\phantom{120)9}40\\\end{array}
Find closest multiple of 120 to 640. We see that 5 \times 120 = 600 is the nearest. Now subtract 600 from 640 to get reminder 40. Add 5 to quotient.
\text{Quotient: }5 \text{Reminder: }40
Since 40 is less than 120, stop the division. The reminder is 40. The topmost line 005 is the quotient. Remove all zeros at the start of the quotient to get the actual quotient 5.