1. Length Unit Conversion (Easy Method)

2. Metric Conversion (Length)  SI to SI
(Left to Right) multiply 10x 3 1 1 1 1 1 1 3
Mega
Kilo
Hecto
Deca
(Unit)
Deci
Centi
Milli
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

3. Example: Convert 5 km to mm
5 km = 5 x 106 mm = mm
(Left to Right) multiply 106 = 3 3 1 1 1 1 1 1 3 3 Gm Mm km hm
da m
(meter) dm cm mm µm nm
Count Boxes = 6
= 3
= 1

4. Example: Convert 675 cm to m
(Right to Left) divide 102 = 100 3 3 1 1 1 1 1 1 3 3 Gm Mm km hm
da m
(meter) dm cm mm µm nm
Count Boxes = 2
675 cm = 675 / 102 m = 6.75 m

5. Example: Convert 675 km to µm
(Left to Right) multiply 109 = 1000,000,000 3 3 1 1 1 1 1 1 3 3 Gm Mm km hm
da m
(meter) dm cm mm µm nm
Count Boxes = 6+3=9
675 km = 675 x 109 µm

6. 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
1.15
1760 3 12
25.4
nmi mi yd ft
inch mm
(Right to Left) divide

7. Example: Convert 5.2 mi to inch
5.2 mi = 5.2 x 1760 x 3 x 12 = inch
(Left to Right) multiply
1.15
1760 3 12
25.4
nmi mi yd ft
inch mm

8. Example: Convert 86752 mm to mi
(Right to Left) divide
1.15
1760 3 12
25.4
nmi mi yd ft
inch mm

9. 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 = mm
(Left to Right) multiply
1.15
1760 3 12
25.4
nmi mi yd ft
inch mm

10. Example: Convert 80.6 mi to km
Step2: Convert mm to km 80.6 mi = mm = / = km
(Right to Left) divide 106 = 3 3 1 1 1 1 1 1 3 3 Gm Mm km hm
da m
(meter) dm cm mm µm nm
Count Boxes = 6

11. 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 3 1 1 1 1 1 1 3 X Mm km hm
Da m
(m) dm cm mm µm
Imperial
Scale
1.15
1760 3 12
25.4
Unit Conversion Strip Y
nmi mi yd ft
inch mm

12. Exercise

13. Solution

14. Area Unit Conversion (Easy Method)

15. Area
Area is the quantity that expresses two- dimensional figure or shape.

16. Example: Calculate the area of plot

17. Solution

18. Area A1

19. Area A2

20. Area A3

21. Area A4

22. Area A5

23. Total Area (A)

24. Metric Conversion (Area)  SI to SI
(Left to Right) multiply 102x 3 1 1 1 1 1 1 3
Mega
Kilo
Hecto
Deca
(Unit)
Deci
Centi
Milli
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

25. Example: Convert 20 sq. km to sq. m
(Left to Right) multiply 103x2 = 106 = 3 1 1 1 1 1 1 3
Mega
Kilo
Hecto
Deca
(m2)
Deci
Centi
Milli
Micro
Count Boxes = 3
20 sq. km = 20 x 106 sq. m = 20,000,000 sq. m

26. 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 = mm 1 sq km = 100 ha 1 ha = 10,000 sq. m 1 ac = ha 1 marla = 225 sq ft = 21 sq m = 25 sq yard 1 canal = 20 marla
640
4840 9
144
645.16
Sq. mi ac
Sq. yd
Sq. ft
Sq. in
Sq. mm
0.405
10,000
10.764 ac ha
sq. m
sq. ft 20
225
canal
marla
Sq. ft

27. Exercise