Page 13 - 01-Yr5_Front cover-ccp.indd

15
• Metric and Imperial 30 cm ruler marked with
metric on<) Imperial units
l[jJ a Check that the length of this pencil is 5 inches to the nearest half-inch. [§] Without measuring, work out the approximate length in
centimetres of lines this long. -=I•N&10--
a Bins b 10ins c 3ins d 11 ins
e 9ins f 2 ft g Sft h 10ft PAGE 21
lif] Copy and complete a
these tables.
b Check that the width of this open book is 1 foot 2 t inches
to the nearest half-inch.
a 20 cm b 25 cm c 7·5 cm
!SJ Choose 6 lengths shorter than your ruler There ore 12.inches in Jill] Explain a quick way to convert:
rn and Imperial units. a foot Use 'Ins' and 'ft' c feet to centimetres. d 27·5 cm e 22·5 cm f 60 cm
to estimate, then measure. in metric
a inches to centimetres
as shortened ways to
b inches to millimetres
write 'inches' and 'feet'.
Record on a table like this.
Metric units I Imperial units g 150 cm h 300 cm
a Practical: check length of pencil
Estimate Measurement ~ a Draw a sketch of an item of furniture
in your classroom.
to nearest half-inch. - I (inches) (nearest half-inch) b Mark its length, breadth 105cm.
and height in both metric (Jjt 6in.s)
and Imperial units.
b Practical: check width of page to
nearest half-inch. KEJ Rule lines of these lengths. Write the length on top of each line. [ill Show how you can work out approximately how tall a b
a 15cm b 175mm c 4ins d 25mm e 12·5cm f 2ins in centimetres people of these heights are.
g Sins h 100mm i Scm j Bins k ?ins I 1 in
a 2ft 4ins b 31! 9ins c Sf! 2ins d 6ft 3ins 1 in = 2·5 cm 25 mm = 1 in
Ki] Write which pairs of lines are 2 ins = 5 cm 50 mm = 2 ins
almost equal in length. / .....
Like this: Line a (15 cm) = line • (• ins). CHALLENGE 3 ins = 7·5 cm 75mm = 3 ins
Open: choose six lengths and
~ Copy and complete. 2·5 cm is about the same length as • in. •If 1in ::: 2·5cm, complete this in different ways. • cm ::: • ft • ins 4 ins = 10 cm 100mm = 4 ins
record their measurements in 1 in is approximately • mm. • Start with lengths up to 100 cm. 5 ins = 12·5 cm 125mm = S ins
1 ft is about the same length as • cm.
metric and Imperial units.
6 ins = 15 cm 150mm = 6 ins
7 ins = 17·5 cm 175mm = 7 ins
8 ins = 20 cm 200mm = 8 ins
q ins = 22·5 cm 225mm = q ins
Practical: rule lines of the following Line a (15 cm) = line j (6 ins) Open: explain a quick way to 10 ins = 25 cm 250mm = 10 ins
lengths. convert: 11 ins = 27·5 cm 275mm = 11 ins
Line d (25 mm) = line I (1 in)
a 15cm b 175mm a inches to centimetres (multiply 12 ins = 30 cm 300mm = 1 ft
Line b (175 mm) = line k (! ins) inches by 2·5);
c 4ins d 25mm
Line e (12·5 cm) = line g (5 ins) b inches to millimetres (multiply
e 12·5cm f 2ins inches by 25);
Line c (4 ins) = line h ( 100 mm)
g Sins h 100 mm c feet to centimetres (multiply feet
Line f (2 ins) = line i (5 cm)
5cm 6ins by 30).
k ?ins 1 in
Challenge
Open: sketch an item of furniture Open: complete this in different
and mark its measurements. ways Dem D = D ft Dins.
2·5 cm is about the same length as 1 in.
Infinite possible answers but they
1 in is approximately 25 mm. [@] should be similar to:
5 cm = 0 ft 2 ins, 50 cm = 1 ft 8 ins,
1 ft is about the same length as 30 cm. a ?Ocm b 112·5cm
72·5 cm = 2 ft 5 ins.
c 155cm d 187·5cm