Which of the following numbers
has 21 as a factor?

Which of the following lists all the
factors of the number 46?

3 is a factor of x. x is a factor of
63. The possible value of x is

Which of the following is a prime
number?

Which of the following is a prime
factor of the number 50?

The first three prime numbers
which are greater than 20 are

Which of the following shows the
prime factorization of 232?

Which of the following is a
common factor of 17 and 51?

Which of the following sets of
numbers have a common factor
of 7?

What is the greatest number that
can divide 18, 54 and 63 without
leaving any remainder?

Which of the following sets of
numbers have 2 as their highest
common factor?

What is the highest common
factor of 24, 64 and 132?

The highest common factor of 18
and y is 9. The possible value of
y is

Which of the following is not a
common multiple of 12 and 20?

Which of the following sets
of numbers have the lowest
common multiple of 48?

The lowest common multiple of
4, 5 and x is 40. The value of x is

A rectangular plot of land is
18 m wide and 24 m long. If the
owner wants to build a fence
around the land, with equal and
the greatest possible distance
between every two adjacent
poles of the fence, what should
the distance between every two
adjacent poles of the fence be?

Alex has an equal number of
action figures and toy cars. He
stores all the action figures in
boxes of 10 and all the toy cars in
boxes of 12 with none remaining.
What is the smallest number of
each type of toy that Alex could
have?

Alisa has an equal number of
bottles of orange juice and grape
juice. She divided all the bottles
of orange juice into 24 bottles per
pack and all the bottles of grape
juice into 6 bottles per pack. If
there are no remainders left,
what is the minimum number of
bottles of each type of juice?

27 blue marbles, 45 red marbles
and 63 yellow marbles are placed
in some boxes with an equal
number of marbles of the same
color in each box. If there are no
marbles left outside the boxes,
how many boxes are there?

(22 – 2.48 ÷ 0.16) × (1.15 + 0.85)
=

0.7 × (8 – 0.8 + 0.08) =

33.285 ÷ 2.1 – 9.048 =

The price of chicken meat is
75.50 Baht per kg. If Jom buys
2.5 kg of chicken meat, how
much money does he have to
pay?

The total mass of 45 guavas
and the basket is 24.99 kg. If the
basket weighs 0.24 kg, what is
the average mass of one guava?

Andy has enough money to buy
exactly 15 rulers which costs
25.75 Baht each. If each pencil
costs 10.50 Baht, what is the
maximum number of pencils that
he can buy with his money?

James has a ball of string. He
cuts out 25 pieces of string each
0.55 meter long and 12 pieces
of string each 0.35 meter long. If
he still has 12.05 meters of string
left, how long is the ball of string?

Pen X costs 16.25 Baht. Pen
Y is 3.50 Baht more expensive
than pen X. If Yin has 100 Baht,
what is the most number of pen Y
could she buy?

Min weighs 48.6 kg. David
weighs 2.8 kg lighter than Min. If
the total mass of David and Joe
is 95 kg, find the mass of Joe.

How much is 34% of 1,500?

What is 60% of 365 days?

On a certain day, there were a
total of 60 flights that took off from
an airport. If 15% of them were
not on time, what is the number
of flights that were not on time?

What is the percentage of 60 out
of 48?

What is 50 Satang out of 2 Baht
expressed as a percentage?

The sales tax on a 450-Baht pair
of shoes is 31.50 Baht. What
is the rate of the sales tax, in
percentage?