Maths Practice Paper

Done on: 8th Oct 2010

Distributed Back: 18th Oct 2010

Section A

1. (3)
2. (2)
3. (4)
4. (1)
5. (2)
6. (3)
7. (3) [Draw out the times, the answer will be clear]
8. (1) [Find angle PSV = 90- 37. Since TSVU is a square, angle a = 90 - angle PSV = 37]
9. (3)
10. (1)
11. (2) [Finding smallest possible sum of the 2 numbers means the lowest possible number for rounding up. For 800, it will be 750; and for 400, it will be 350. Thus, the sum will be 1100. ]
12. (1) [Convert all the fractions in the question to decimals first.]
13. (2)
14. (4)
15. (2)

Section B

16) A= 8345, B = 8210

17) 73, 800

18) 86 Mangoes

19) 11/42 [ 1 - 4/7 - 1/6 = 42/42 - 24/42 - 7/42]

20) 1/2

21a) QR/QZ

21b) SR

22) Restaurant

23) 0.545, 0.54, 0.455, 0.045

24) 1.46

25) 48

26) 80 marks

27) 150 pupils

28) DE = 2.25, EF = 3.5

29) 1|1/4 or 1.25 [3/4 + 0.5 = 0.75 +0.5]

30) $33.00 [Draw models]

31) 18 days [For such questions, it is always round up. If you round down, it means they did not save enough]

32a) 12 July

32b) 8.45pm / 20 45

33) 92cm^2 [total length is 23 cm, note overlapped part]

34) 925cm^2

Section C

35a) Money at first = (27 x 8) + 9

= $225.00

35b) Boxes at sales = $225 / 6

~ 37

More boxes = 37 - 27

= 10

36) Duck Eggs on Friday = 166 - 78

= 88

Total eggs on Fri = 166 + 88

= 254

Eggs sold on Sat = 254/2

= 127

Total eggs sold = 254 + 127

= 381

37) Each set, 1 cup + 1 plate = $7 + ($7-3)

= $11

Total sets bought = $264/ $11

= 24

Amount more = $24 x $3

= $72

38) Daisies = 1/5 x 240

= 48

Daisies removed = 1/3 x 48

= 16

Tulips = 3/8 x 240

= 90

Tulips removed = 5/6 x 90

= 75

Flowers left = 240 - 16 - 75

= 149

39) Draw Model, base unite 10. Yellow will take 4 units, purple will take 5, leaving only 1 unit for purple.

After drawing model, you will realise that

4 units -> 60

10 units -> 150

40) Total spent on crayons = $ $5.35 x 2

= $10. 70

Total spent on drawing books = $1.70 x 5

= $8.50

Amount Saved = ($10.70 + $8.50) - $16.99

= $2.21

41a) 19 05 - 13 35 = 5h 30mins

b) 21 00 - 19 05 = 1hr 55mins

42) List down all the factors for 54 & 102. Since it was given that W is a square, we must identify the common factor as the breadth of W = 6.

From this, we conclude that

Length of V = 102/6

= 17 cm

Breadth of V = 54/6

= 9 cm

Difference in Area = Area of V - Area of W

= (17 x 9 ) - ( 6 x 6 )

= 117 cm^2

Remarks:

• Many of you could not finish the paper within the 1hr 45 mins. Although the timing was not followed strictly, it is still crucial to manage your time properly.
• Do not be careless, read the question carefully and be sure to know what they are asking for. Highlight if need be.
• If you are unsure where to start, list down the information given as working.
• Ascending is from smallest to biggest, descending is from biggest to smallest.