Question

[Đỗ Quỳnh Trang]

A ) Calculate 2 + 4 + 6 + 8 +…..+ 200 = ____________

B ) Calculate 111 : 3 + 222 : 6 + 333 : 9 + 444 : 12 = ______

C ) This year, George is 5 years old; his dad is 35 years old. After how many years, his dad is 4 times older than George?

D ) 1st of July 2014 is Tuesday, what day is 30th July 2014?

E ) There are a total of 28 roosters and rabbits in a cage. there are 80 legs altogether, calculate the total numbers of roosters.

F ) Calculate 9999 x 0.7 + 1111 x 2.7 = _________

G ) Calculate 13.8 x 4.6 x 5.4 : 1.38 : 2.3 : 2.7 = ____________

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Answer 1

[Nguyễn Minh Quang]

A ) Calculate 2 + 4 + 6 + 8 +…..+ 200 = \(2\left(1+2+3+..+100\right)=2\times100\times\frac{101}{2}=10100\)

B ) Calculate 111 : 3 + 222 : 6 + 333 : 9 + 444 : 12 =\(37+37+37+37=148\)

C ) This year, George is 5 years old; his dad is 35 years old. After how many years, his dad is 4 times older than George?

five year 

D ) 1st of July 2014 is Tuesday, what day is 30th July 2014?

is Thursday

E ) There are a total of 28 roosters and rabbits in a cage. there are 80 legs altogether, calculate the total numbers of roosters.

sixteen roosters 

F ) Calculate 9999 x 0.7 + 1111 x 2.7 = \(1111\times5,3+1111\times2,7=1111\times7=7777\)

G ) Calculate 13.8 x 4.6 x 5.4 : 1.38 : 2.3 : 2.7 = \(\frac{13,8}{1,38}\times\frac{4,6}{2,3}\times\frac{5,4}{2,7}=10\times2\times2=40\)