Length Unit Conversion(Easy Method)

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Metric Conversion (Length) SI to SI

1 1 1 1 1 1 3Mega Kilo Hecto Deca (Unit) Deci Centi Milli Micro

(Left to Right) multiply 10x

(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)

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3 33 3

Example: Convert 5 km to mm

1 11 1 1 1Mm km hm da m (meter) dm cm mm µm

(Left to Right) multiply 106 = 1000000

Count Boxes = 6

5 km = 5 x 106 mm = 5000000 mm

Gm nm

= 3 = 1 3

Example: Convert 675 cm to m

(Right to Left) divide 102 = 100

Count Boxes = 2

675 cm = 675 / 102 m = 6.75 m

3 33 3 1 11 1 1 1Mm km hm da m (meter) dm cm mm µmGm nm

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Example: Convert 675 km to µm

Count Boxes = 6+3=9

675 km = 675 x 109 µm

3 33 3 1 11 1 1 1Mm km hm da m (meter) dm cm mm µmGm nm

(Left to Right) multiply 109 = 1000,000,000

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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

1.15 3 121760 25.4nmi mi yd ft mminch

(Left to Right) multiply

(Right to Left) divide

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Example: Convert 5.2 mi to inch

5.2 mi = 5.2 x 1760 x 3 x 12 = 329472 inch

1.15 3 121760 25.4nmi mi yd ft mminch

(Left to Right) multiply

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Example: Convert 86752 mm to mi

86752 = 86752 ÷25.4 ÷ 12 ÷ 3 ÷ 1760 = 0.0539 mi

1.15 3 121760 25.4nmi mi yd ft mminch

(Right to Left) divide

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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

1.15 3 121760 25.4nmi mi yd ft mminch

(Left to Right) multiply

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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

Count Boxes = 6

3 33 3 1 11 1 1 1Mm km hm da m (meter) dm cm mm µmGm nm

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Metric Scale

Unit Conversion Strip

Length Unit Conversion Strip

3 1 1 1 1 1 1 3Mm km hm Da m (m) dm cm mm µm

(Left to Right) multiply 10x Metric Scale

(Right to Left) divide Y Imperial Scale

1.15 3 121760 25.4mi yd ft mminchImperial Scale

(Left to Right) multiply Y Imperial Scale

(Right to Left) divide 10x Metric Scale

X

Y nmi

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Exercise

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Solution

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Area Unit Conversion(Easy Method)

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Area

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

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Example: Calculate the area of plot

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Solution

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Area A1

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Area A2

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Area A3

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Area A4

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Area A5

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Total Area (A)

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Metric Conversion (Area) SI to SI

(Left to Right) multiply 102x

(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)

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3 1 1 1 1 1 1 3Mega Kilo Hecto Deca (Unit) Deci Centi Milli Micro

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Example: Convert 20 sq. km to sq. m

(Left to Right) multiply 103x2 = 106 = 1000000

Count Boxes = 3

20 sq. km = 20 x 106 sq. m = 20,000,000 sq. m

3 1 1 1 1 1 1 3Mega Kilo Hecto Deca (m2) Deci Centi Milli Micro

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10.764

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

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

640 4840 9 144 645.16Sq. mi ac Sq. yd Sq. ft Sq. mmSq. in

0.405 10,000ac ha sq. m

20 225canal marla Sq. ft

sq. ft

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Exercise

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