160976

Big Teddy = 16 x 19 x 12 = 3648cm .

Classroom = 280 x 710 x 840 = 166,992,000.

Using rounding we know the Teddy is approximately 3600cm and the classroom is 166,000,000. Therefore the volume of the classroom divided by the volume of bears gives us an answer of approximately 46,111 bears would fit in.

However, pupils did say this is assuming the classroom is completely empty. Moreover, we have cupboard space, which is not included in the volume and window sills that would affect the total amount.