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1)Write down two numbers such that their H.C.F. is 1 and their L.C.M. is
(a) an even number.
2, 3
(b) an odd number.
3, 7


2)A hawker spent $180 to buy 600 toy balls.The hawker is
going to sell the balls.Suggest the selling price for each toy
ball such that he can get a profit percentage of at least 40%
after all the balls are sold.
price >= $(180/600)x(1+0.4) = $0.42


3)The original weights of Chris and Anna were 72kg and 66kg
respectively.After joining a slimming programme,both of them lost some weight.If Chris lost 20% of his weight,what is the possible percentage
decrease in Anna's weight so that the different between their weights is less than 4kg?
possible percentage = p%
72x(1-0.2) - 66x(1-p/100) < 4
[72x0.8 - 4]/66 < 1 - p/100
p<18.79



4)A hawker bought X oranges.He sold the remaining oranges
at $5 each.If his total income was between $160 and $200
find two possible values of X.

5)If 10m+n=10n+m,suggest two pairs of possible values of m and n.
10m+ n = 10n + m
9m = 9n
m = n
two pairs of possible values:
m = 1, n = 1 or
m = 0, n = 0


6)In the equation AB+AC=BB,each letter represents from 0 to 4
Different letters represent different integers.Suggest one value for eavh letter which satisfies the equation.
A = 2, B = 4, C = 0. Then 24 + 20 = 44
A = 1, B = 2, C = 0. Then 12 + 10 = 22


7)Complete the following equation using directed numbers.

(-口+4)-(口+6)=10



8)The following table shows the scroes that Ricky and Daisy got in four round of a game .

ROUND RICKY'S SCORE DAISY'S SCORE
1 +12 -3

2 +5 -7

3 -18 +5

4 +4 ?


The player getting a higher total score wins the game .If Daisy
wins the game, find the possible score she got in the ath round.


9)The base and height of a triangular metal plate are 8 cm and
4cm respectively.The metal plate is melted and recast into a metal plate in the shape of a trapezium with a height the same as that of the triangle.Find two possible pairs of the lengths of the shorter base and the longer base of the new metal plate.(Hint: The thickness of metal plates can be ignored.)