Toan tieng anh cap quoc gia lop 4

BỘ GIÁO DỤC VÀ ĐÀO TẠO



ĐỀ THI CHÍNH THỨC
CUỘC THI GIẢI TOÁN QUA INTERNET NĂM 2015
VÒNG THI CẤP TOÀN QUỐC
LỚP 4 TIẾNG ANH
Ngày thi : 10/04/2015
Thời gian làm bài : 60 phút



EXAM 1 : WEB
EASY
1.

4567
6789
3456
5678

Key : >

2.

1818
2727 of 2376 is {}
Key : 1584

3.
Find x such that: 𝑥+17×12=216
Answer : x = {}
Key : 12
4.
Professor Ngo Bao Chau was born in 1972. He was born in the {}th century.
Key : 20
MEDIUM
5.
How many 4-digit numbers can you make by using only 0 and 1 ?
Answer:There are {} numbers
Key : 8
6.
The area of a rectangle increases by 57 𝑐
𝑚
2 when each side increases by 3cm. The perimeter of the original rectangle is {}cm
Key : 32
7.
Three oranges are weighted in pairs and
these weights are 400, 412, and 424 gram.
What is the weight of the lightest orange?
Answer:The weight of the lightest orange is {} gram.
Key : 194
HARD
8.
Peter, Bob and Jack do a work. Peter and Bob working together can complete it
in 12 hours. Bob and Jack working together can complete it in 10 hours. Jack and
Peter working together can complete it in 15 hours. Peter needs {}hours to complete this work by himself.
Key : 40
9.
The sum of the digits of all 2-digit numbers is…
Key : 855
10.
Some men meet at a conference. Each man shakes hands with each other exactly once. If there are 4950 handshakes in total then the number of men is {}
Key : 100

EXAM 2 : CÓC VÀNG (ĐÁP ÁN A LÀ ĐÁP ÁN ĐÚNG)
EASY
1.
Find the value of
A
1
2015
2
2015
3
2015
2014
2015 ?
The value of A is:
A.1007 B
4006
2015 C
4003
2015 D
4002
2015

2.
Which of the following numbers
can represent the question mark?
/
A.48 B.54 C.45 D.36
3.
Which of the following is the number 2, 003, 047 ?
A.Two million , three thousand ,
fourty seven
B.Two million , thirty thousand ,
fourty seven
C.Two million , thirty thousand ,
four seven
D.Two million , three thousand ,
four seven
4.
Which of the following numbers is divisible by 6?
A.42378 B.25760 C.33332 D.12357
MEDIUM
5.
John uses
1
3 of his land for growing apples
1
4 for oranges,

1
5 for bananas and the remaining 13 hectares for flowers .
The total area of his land is…hectares .
A.60 B.70 C.50 D.80
6.
Find the value of B=2016×20152015−2015×20162015
Answer:The value of B is:
A.2015 B.2016 C.20152016 D.20162015
7.
The product of 2 natural numbers is 2015 .  Find the smallest possible sum of these two numbers?
Answer:The smallest possible sum of these numbers is:
A.96 B.408 C.2016 D.65
HARD
8.
In the equation :N×U
M+B+E+R=33 six letters are
6 distinct digits from 0 to 9.How many different ways are there
to choose 6−tuples
N,U,M,B,E,R? Answer:There are:
A.48 ways B.32 ways C.36 ways D.24 ways
9.




Find the missing number 𝑥 in the following number sequence:


Answer:𝑥 is:
A.50 B.32 C.34 D.45
10.
One chain with 3 links is 14 cm long. 
Another chain made from 5 links of
the same type is 22 cm long.How long
is a chain with 40 such links?
Answer:A chain with 40 such links is:
/ /
A.162cm long B.160cm long C.158cm long D.155cm long
EXAM 3 : ĐUA XE
EASY
1.
The number
4B573 is divisible by 9.The digit B is…
Key : 8
2.
Find 𝑥 such that 𝑥
1
3
4
15
41
15