# Đề thi APMOPS năm 2012

1) Find the value of $29999+2999+299+29+9$

2) $ABCD$ is a parallelogram. $P, Q, R, S$ are the midpoints of the 4 sides of the parallelogram. If the area of the shaded region (the parallelogram in the middle) is $20$ cm$^2$, find the area of the parallelogram $ABCD$.

3) Jane added up the digits of the whole number $3^{2012}$ and obtained a new number $n_1$. She then added up all the digits of $n_1$ and obtained another number $n_1$. She continued doing this until she obtained a single digit number. Find the value of this number.

4) The product of 4 consecutive whole numbers is \$latex5040\$. Find the value of the smallest number.

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