We Two -students were handed over 1 blank slip each.They were asked to write a 4 digit no. of their choice on each slip. All the slips were collected in the box.
The slips were shuffled in the box.Students came one by one and picked the slips in pair from the box.They were asked to write each other's number vertically and add.
The answers after addition were written on the board.They observed the commutative
property of addition. They also found the pair with the greatest sum.
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