Length Unit Conversion
(Easy Method)
1
Metric Conversion (Length)  SI to SI
(Left to Right) multiply 10x
Mega
3
Kilo
1
Hecto
1
Deca
1
(Unit)
1
Deci
Centi
1
1
Milli
3
Micro
(Right to Left) divide 10x
How to memorize?
Mega (M)
Kilo (k)
Hecto (h)
Deca (da)
Unit
Deci (d)
Centi (c)
Milli (m)
Micro (µ)
My
King
Henry
Doesn’t
Usually
Drink
Chocolate
Mango
Milkshake
2
Example: Convert 5 km to mm
5 km = 5 x 106 mm = 5000000 mm
(Left to Right) multiply 106 = 1000000
Gm 3 Mm 3
km
1
hm
1
da m
1
(meter)
1
dm
1
cm
1
mm 3 µm
3 nm
Count Boxes = 6
=3
=1
3
Example: Convert 675 cm to m
(Right to Left) divide 102 = 100
Gm 3 Mm 3
km
1
hm
1
da m
1
(meter)
1
dm
1
cm
1
mm 3 µm
3 nm
Count Boxes = 2
675 cm = 675 / 102 m = 6.75 m
4
Example: Convert 675 km to µm
(Left to Right) multiply 109 = 1000,000,000
Gm 3 Mm 3
km
1
hm
1
da m
1
(meter)
1
dm
1
cm
1
mm 3 µm
3 nm
Count Boxes = 6+3=9
675 km = 675 x 109 µm
5
Imperial Conversion (Length)
Memorize Following
Basic Conversion
1 nmi = 1.15 mi
1 mi = 1760 yd
1 yd = 3 ft
1 ft = 12 inch
1 inch = 25.4 mm
(Left to Right) multiply
nmi 1.15
mi
1760
yd
3
ft
12
inch 25.4
mm
(Right to Left) divide
6
Example: Convert 5.2 mi to inch
5.2 mi = 5.2 x 1760 x 3 x 12 = 329472 inch
(Left to Right) multiply
nmi 1.15
mi
1760
yd
3
ft
12
inch 25.4
mm
7
Example: Convert 86752 mm to mi
86752 = 86752 ÷25.4 ÷ 12 ÷ 3 ÷ 1760 = 0.0539 mi
(Right to Left) divide
nmi 1.15
mi
1760
yd
3
ft
12
inch 25.4
mm
8
Example: Convert 80.6 mi to km
Step1: Convert 80.6 mi to mm
80.6 mi = 80.6 x 1760 x 3 x 12 x 25.4 = 129713126.4 mm
(Left to Right) multiply
nmi 1.15
mi
1760
yd
3
ft
12
inch 25.4
mm
9
Example: Convert 80.6 mi to km
Step2: Convert 129713126.4 mm to km
80.6 mi = 129713126.4 mm = 129713126.4 / 1000000= 129.713 km
(Right to Left) divide 106 = 1000000
Gm 3 Mm 3
km
1
hm
1
da m
1
(meter)
1
dm
1
cm
1
mm 3 µm
3 nm
Count Boxes = 6
10
Length Unit Conversion Strip
(Left to Right) multiply 10x  Metric Scale
(Right to Left) divide 10x  Metric Scale
(Left to Right) multiply Y  Imperial Scale
(Right to Left) divide Y  Imperial Scale
Metric
Scale
X
Imperial
Y
Scale
Mm
3
nmi 1.15
km
1
hm
1
Da m
1
(m)
mi
1760
yd
3
ft
12
inch 25.4
1
dm
mm
1
cm
1
mm
3
Unit Conversion Strip
11
µm
Exercise
12
Solution
13
Area Unit Conversion
(Easy Method)
14
Area
Area is the quantity
that expresses twodimensional figure
or shape.
15
Example: Calculate the area of plot
16
Solution
17
Area A1
18
Area A2
19
Area A3
20
Area A4
21
Area A5
22
Total Area (A)
23
Metric Conversion (Area)  SI to SI
(Left to Right) multiply 102x
Mega
3
Kilo
1
Hecto
1
Deca
1
(Unit)
1
Deci
Centi
1
1
Milli
3
Micro
(Right to Left) divide 102x
How to memorize?
Mega (M)
Kilo (k)
Hecto (h)
Deca (da)
Unit
Deci (d)
Centi (c)
Milli (m)
Micro (µ)
My
King
Henry
Doesn’t
Usually
Drink
Chocolate
Mango
Milkshake
24
Example: Convert 20 sq. km to sq. m
(Left to Right) multiply 103x2 = 106 = 1000000
Mega
3
Kilo
1
Hecto
1
Deca
1
(m2)
1
Deci
1
Centi
1
Milli
3
Micro
Count Boxes = 3
20 sq. km = 20 x 106 sq. m = 20,000,000 sq. m
25
Unit Conversion (Area)
Memorize Following Basic Conversion
1 sq. mi = 640 ac
1 ac = 4840 sq. yd
1 sq. yd = 9 sq ft
1 sq. ft = 144 sq. inch
1 sq. inch = 645.16 mm
Sq. mi 640
1 sq km = 100 ha
1 ha = 10,000 sq. m
1 ac = 0.405 ha
1 marla = 225 sq ft = 21 sq m = 25 sq yard
1 canal = 20 marla
canal
ac
4840 Sq. yd
ac
20
0.405
9
Sq. ft 144 Sq. in 645.16 Sq. mm
ha 10,000 sq. m
10.764
sq. ft
marla 225 Sq. ft
26
Exercise
27