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CUSTOMARY LINEAR UNITS

GRADE 3 copyright@Ed2netLearning,Inc 1

Hello, How are you doing?

Today, we are going to start a new lesson on customary Linear Units.

Unit

A fixed amount that is used as a standard of measurement is defined as Unit .

Example – the length of a box is 6 cm.

The measurement of distance between two end points is defined as Length .

Example – the length of the line segment is 3 cm.

Customary units of length

Customary Units of length are   Foot Inch   Yard mile copyright@Ed2netLearning,Inc 4

Customary Units or Metric Units

Most Countries use the metric system of measurement. Example – cm, m, km, kg, g, L The United States uses the Customary Units of measurement. Example – feet, inch, yard, mile copyright@Ed2netLearning,Inc 5

Relation in Customary Units of length 1 foot = 12 inch (in) 1 yard = 36 inch = 3 feet 1 mile = 1,760 yards = 5,280 feet copyright@Ed2netLearning,Inc 6

Finding length using customary units   Line up one end of the object to the “0” mark of the ruler.

Find the inch mark that is closest to the other end of the object.

The Length of the line segment is 3 inch.

Find the length of the line segment shown using inch ruler.

Conversion of units

 To convert larger unit to smaller, multiply with the conversion number.

Example – 3 feet = 12 x 3 inch = 36 inch  To convert smaller unit to larger, divide with the conversion number.

Example – 48 inch = 48/12 = 4 feet copyright@Ed2netLearning,Inc 10

Which is greater unit?

a) b) c) d) Inch feet Mile yard copyright@Ed2netLearning,Inc 11

Which is greater than 9 feet?

a) b) c) d) 110 inch 107 inch 100 inch 90 inch copyright@Ed2netLearning,Inc 12

Which tool is used to draw a line of length 8 ½ inch.

What is the estimated height of the tennis racket?

a) b) c) 2 ft 2 yard 2 mile copyright@Ed2netLearning,Inc 14

ASSESSMENT

1. In Baseball, the distance between first and second base is 60 feet. How many yards is this distance?

2. What is the length of the dropper shown below?

3. Which is not correct?

a) b) c) d) 2 feet = 26 inch 2 feet = 24 inch 3 feet = 36 inch 3 yard = 9 feet copyright@Ed2netLearning,Inc 18

4. Write the number that makes the sentence true.

5 yd = --- feet a) b) c) d) 15 12 18 10 copyright@Ed2netLearning,Inc 19

5. Victor wants to measure the length of his cat’s tail. Which tool is he most likely to use?

a) b) c) d) Inch ruler Measuring tape Paper clips Yard stick copyright@Ed2netLearning,Inc 20

6. What unit would you use to measure the distance of the school lawn?

a) b) c) d) Inch Feet Mile yard copyright@Ed2netLearning,Inc 21

7. A shoe is about 1 ⁫

a) b) c) Inch Foot Yard copyright@Ed2netLearning,Inc 22

8. Kelvin is practicing her shot put. She throws the Shot Put 96 inch. Which is true?

a) b) c) d) She throws 6 feet She throws 7 feet She throws 8 feet She throws 9 feet copyright@Ed2netLearning,Inc 23

9. The window of the hall is 4 feet wide. How many inches wide is the window?

10. Complete the following.

6 ft 3 in = ----- in.

Recap

      Unit Customary unit of length Customary unit or Metric Unit Conversion unit Solved examples Practice problems copyright@Ed2netLearning,Inc 26

Good Work!

Now practice worksheets on the lesson.