II. Area (Diện tích)
1. Surface area of 3D figure (Diện tích bề mặt của hình 3D)
Exercise 1: Candace places some identical cubes with side length 2cm on each other to get the figure below. Then she paints all the surfaces of the figure. Find the painted area.
(Dịch sang tiếng việt) Candace xếp các khối lập phương y hệt có cạnh dài 2cm chồng lên nhau để được hình dưới đây. Sau đó cô ấy sơn lên toàn bộ bề mặt của hình đó. Tính diện tích phần được sơn.

cho mình xin cách giải chi tiết và đáp án

1>My class of 32 students are going to a Fun Fair for children and need to buy entrance tickets for each student. The price of an entrance ticket is 5,000 dong. The good news is that when we buy 5 tickets, the Fun Fair gives us 1 extra ticket for free. How much does my class have to pay to buy enough tickets for the whole class?

2>Minh’s family needs to tile the floor of a rectangular room, 5 m in length and 3.8 m in width, with square tiles. The length of the side of each tile is 0.5 m. Each of the tiles close to the wall, if not a whole one, is cut from a whole tile. The total number of tiles needed to tile the room is ?

3>A student cycles from home to school in a distance of 1,200 m with speed of 2.5 m/s. There are 4 crossroads on the way; the time to stop for red lights at each crossroad is 30 s the longest. The longest time it takes the student to reach school is?

Fill in the blank with the correct number

Question 1:
Complete the number pattern: 
 0,3,8,15,24,,48.

Question 2:
Find the area of the shaded region if A and B are squares of sides 5cm and 8cm respectively. 

Answer: The area of the shaded region is  .
(write your answer by decimal in simplest form)

Question 3:
If , compute =.

Question 4:

The side of each square grid is 2cm. Find the area of the shaded region.
Answer: The area of the shaded region is  .

Question 5:
If , find the value of m in .
Answer: m=.

Question 6:
How many whole numbers between 1 and 100 are not divisible by 3 or 11?
Answer:  numbers.

Question 7:
Evaluate:
=.
(round to four decimal places)

Question 8:
Evaluate:
=.
(write your answer by decimal in simplest form)

Question 9:
Find the whole number A knowing that A is 9 units greater than the average of A, 38, 45 and 67.
Answer: A=.

Question 10:
Find the whole number C knowing that C is 14 units smaller than the average of C, 68, 72, 99.
Answer: C=.