Page 23 - 01-Yr5_Front cover-ccp.indd

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I]] Usi.. a formula to colculate the areas, of these tiles.
• W= ~= ~:f.I1l:410~
E F 15cm I G ~~ "!N l
1 scm .l 3acm ' ~ PAGE 41
30cm '
! l '·
' . . '. [ ___ :.. --''-'-==
1 ~op;rond-complete-these-stetement<;-fGr-<>GVel'iAy-.---..,.; ,
;-rn L.....t:JSelnefarmula to calculate the areas of these tiles.
this floor with tile E.
-·-- tiles are needed for the length.
B 15cm C 15cm
----- tiles are needed for the breadth.
[I] [g] 15cm L b Write similar statements for covering E 30cm x 30cm = qoocm 2
I
---- tiles are needed altogether.
the floor with tile F. 2
A =lx b A =lx b liQJ Sometimes tiles need to be cut to fit around obstacles. Drawing diagrams F 15cm x 15cm = 225cm
[iJ I Explain wtiy the formula for finding the area of a square Calculate the amount of surface these cut tiles will caver con help ,
= 10cm x 5cm l can be written as A = I 2. G 33cm x 33cm = 108qcm 2
18cm
= 50 cm 2 Copy and complete these statements mill 33cm
for covering thew ite wa w1 h ! ile !I-. ~-JF::'£~~~--=.;;2i:;J.; f--·............... ~I
22cm • 15cm
. ----- tiles ore needed for the length. rn,
----- tiles ore needed for the height. 5 cm ~
1
----- tiles are needed altogether.
II1J Write a measurement in place of the letter
@] Write similar statements for covering in each of these rectangle calculations. a 10 tiles are needed for the length.
the wall with: ' a A = 5cm x 9cm b 100cm2 = /ix 10cm c A=15mx8m
2
A 20cm x 20cm = 400cm a tile B d 90 m2= 15mxb e 72cm2=/~18cm f 144m2 = 12 m x b, q tiles are needed for the breadth.
b tile C Show your workings-out
'. c tile D. and any diagrams qo tiles are needed altogether.
2
B 20cm x 15cm = 300cm Explain your answer to c. you draw to help you. r CHALLEN GE
• Use the scale shown. 1 cm represents 20 cm
• Draw scale diagrams of the wall on cm r--r--r--r--1----i b 20 tiles are needed for the length.
40
80
20
0
60
2
100
C 15 cm x 15cm = 225cm LZJ, The tiles are sold in packs of 12. page 40 with tiles A, B, C and D in place.
Work out how many pocks of each tile you would have to buy. 18 tiles are needed for the breadth.
2 m:
D 25cm x 20cm = 500cm . 360 tiles are needed altogether.
~
A square is a rectangle whose a 20 tiles are needed for the length. a 18cm x 22cm = 3q6cm 2
sides are all the same length, so for 12 tiles are needed for the height. 2 2 2
a square A = Ix b is the same as 240 tiles are needed altogether. b (15cm x 15cm)- (5cm x 5cm) = 225cm -25cm = 200cm
A = Ix I which can be written as c (33 cm x 33 cm) - ( 17 cm x 17 cm) = 1 o8q cm 2 - 28q cm = 800 cm 2
2
b 20 tiles are needed for the length.
A= f2.
16 tiles are needed for the height.
320 tiles are needed altogether.
2
c 15 tiles are needed for the length. a 45 cm = 5 cm x q cm b 1 00 cm = 1 0 cm x 10 cm
2
15 tiles are needed for the length. 10 tiles are needed for the height. 2 2
12 tiles are needed for the height. 150 tiles are needed altogether. c 1 20 m = 1 5 m x 8 m d qo m = 15 m x 6 m
180 tiles are needed altogether. Tile D will not fit exactly on this e 72cm = 4cm x 18cm f 144 m = 12 m x 12 m
2
2
height wall, so you need to 'round
up' to 10 to have enough tiles Challenge
and then cut the tiles to shape.
Practical: draw scale diagrams of the wall with the tiles in place.
[l]
Tile A: 15 packs Tile B: 20 packs
Tile C: 27 packs (26 r8) Tile D: 13 packs ( 12 r6)