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# p.6-f.1 Some Math exercise

1.A stack of 180 sheets of paper is 1.5cm thick. Find the thickness of

each sheet of paper in mm ,round off the answer correct to 3 decimal

places.

2.The government plans to build a large housing estate in a new

town. The estate will have twelve 36-storey buildings with 18 units on

each floor. According to the Census, we can estimate the average

number of inhabitants in each unit to be 5.23. Find the number of

inhabitants this eatate will have, round off the answer correct the

nearest ten thousand.

3.Roy and Sandy used their savings to buy two Christmas presnts,

which were of the same price, for their parents.If Roy spent 186.5

dollars and Sandy spent 20 dollars more than Roy,find the price of

each present, round off the answer correct to the nearest hundred

dollars.

4.Florence has a piece of sticker which is trapezoidal.The shorter base

of the sticker is 1.5cm,the longer base is 3 cm and the height is 4cm.

What is the area of the sticker?

### 1 Answer

- Anonymous1 decade agoFavorite Answer
1. The thickness of

each sheet of paper in mm

=1.5/180X10

=0.083mm,cor.to 3d.p.

2.The number of

inhabitants this eatate will have

=12X36X18x5.23

=40668.48

=40000,cor.to nearest ten thousand

3.[(186.5+20)+186.5]/2

=196.5dollars

=200,cor.to the nearest hundred dollars

4.(1.5+3)X4/2

=9cm square

Source(s): me