1. Decimal

2. B A C cm
Decimal
3cm
4cm
3.2cm

3. Integer Part
Decimal Part
￡12.85
1.62m
52.5kg

4. ￡12.85
￡ 10
￡ 2 5P
80P 8 10 ￡ 5
100 ￡
￡0.05
￡ 0.8

5. 1.62m
60cm
2cm 1m 2
100 m 6 10 m
0.6m
0.02m

6. …… The denominator of the fraction is 10,
we can get 1-digit decimal from it.
The denominator of the fraction is 100,
we can get 2-digit decimal from it. ……

7. What is the fraction and decimal?10 3
0. 3 10 9
0. 9 10 7
100 43
0. 7
0. 43

8. 1 2 . 8 5 1 . 6 2 5 2 . 5 Name Unit 10 1 Place Value Chart
Integer Part
Decimal Part
Name
ones
place
Tens
place
Unit 10 1

9. Place Value Chart
Integer Part
Decimal Part
Name
Tens
place
Ones
place
Tenths
place
Unit 10 1
0.1 1 — 10
0.8
0.6
0.5

10. Place Value Chart
Integer Part
Decimal Part
Name
Tens
place
Ones
place
Tenths
place
Hundredths place
Unit 10 1
0.1
0.01 1 — 10 1 —
100
0.05
0.02

11. Name Unit 10 1 0.1 0.01 Place Value Chart Integer Part Decimal Part
Tens
place
Ones
place
Tenths
place
Hundredths
place
Unit 10 1
0.1
0.01 1 — 10 1 —
100
MARA THON km

12. 4 2 . 1 9 5 0 . 0 0 5 Name Unit 10 1 0.1 0.01 0.001 Place Value Chart
bigger
smaller
Integer Part
Decimal Part
Name
Tens
place
Ones
place
Tenths
place
Hundredhs
place
Thousandths
place
Unit 10 1
0.1
0.01
0.001 1 — 10 1 —
100 1 —
1000

13. 0.1
0.2
0.3
0 .4
0.5
0.6
0.7
0.8
0.9 1
0.2=( ) 0.1s 2
0.3= 3 （ ）s
0.1 8
4 0.1s = ( )
0.4
( ) 0.1s =0.8
( ) 0.1s=1 10

14. 0.01
0.02
0.03
0 .04
0.05
0.06
0.07
0.08
0.09
0.1
0.01
0.02=( ) 0.01s 2
0.03=3 ( )s
0.04=( ) 0.01s 4
0.08= 8 ( )s
0.01
( ) 0.01s=0.1 10

15. 0.1
0.01
0.001

16. The ratio between two neighbouring unit is 10.
Place Value Chart
bigger
smaller
Integer Part
Decimal Part
Name
Tens
place
Ones
place
Tenths
place
Hundredhs
place
Thursandths
place
Unit 10 1
0.1
0.01
0.001 1 — 10 1 —
100 1 —
1000 10 10 10 10
Ratio
The ratio between two neighbouring unit is 10.

17. Task1:
9.8
9 is in the ( ) place, it means ( )，
8 is in the ( )place, it means ( )。
ones
9 ones
tenths
8 tenths

18. Task2:
0.538 is composed of ( ) 0.1s,
( )0.01s and ( )0.001s.
Seven 0.1s and nine 0.001s make
( ). 5 3 8
0.709

19. Task3:
6.284=( ) 1+( )0.1+( )0.01
+( )0.001
76.59=7( )+( )1+( )  ( )
0.23= ( )0.1+( )0.01 6 2 8 4 10 6 5
0.01 2 3

20. what is the value of the coloured digit ?1)
A: B: C: 0.05 2)
A: B: C: 0.05 3)
A: B: C: 0.05

21. 4 7 9 Challenge Where is the decimal point ？7 9
1、This number has two “0”s in the decimal part.
2、What is the biggest decimal number you can make ?
3、In the decimal part, there are s and s.

22. Summary
1、The denominator of the fraction is 10, we can get 1-digit decimal from it.
The denominator of the fraction is 100,
we can get 2-digit decimal from it. ……
2、 Recognise the value of each digit and know the relationship : tens ;ones; tenths ;hundredths.
3、 Work out the combination of adecimial:1.65=1×1+6×0.1+5×0.01

23. Challenge Find“ 63.5” Find “1.72” Find “42.195” 63 64 1.0 1.5 42.15
42.20
Find “42.195”