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ESTIMATION. Estimation means an approximate calculation. Without actual measurement , we estimate Lily’s height to be 120 cm. …we estimate the board’s length to be 2 wah . …we estimate the toy gun’s length to be 10 cm. …we estimate the box’ height to be 20 cm . Guess. - PowerPoint PPT Presentation
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ESTIMATION Estimation
means an approximate calculation.
Without actual measurement , we estimate Lily’s height to be 120 cm.
…we estimate the board’s length to be 2 wah.
…we estimate the box’ height to be 20 cm.
…we estimate the toy gun’s length to be 10 cm.
Guess
Baby Yan- yan’s height:
a. 68 cmb. 58 cm
The praying mantis’ length:
a. 32mmb. 35mm
Guess
Teacher Toto’s height:
a. 164 cmb. 250cm
Guess
The elephant’s height:
a. 2 wahb. 1 wah
Estimate
BLEEEEEEE!!!!!YOU’RE WRONG
HURRAY!!!!!YOU’RE RIGHT!
Exercises
1. Circle the appropriate eye-estimation.
a ba. Length of a pen 140 cm 14 cm
b. Height of a student 120 m 120 cm
c. Height of my parent 160 cm 160m
d. Length of a desk 300cm 30m
e. Height of the room 8 m 80 cm
f. Height of a rubber 30 cm 3 cm
g. Length of a comb 20 cm 10 cm
h. Length of a notebook 30 cm 5 cm
2. Estimate the length or height of the objects below. Indicate the errors.
Objects Estimate Measure Error
Example a. desk 58 cm 60 cm 60 -58= 2 cm
b. pencil
c. chair
d. rubber/eraser
e. notebook
3. Estimate the perimeter of the given shapes in centimeter.Then, measure using the ruler. Indicate the error. Shapes Estimate (cm) Using ruler (cm) Error (cm)
Example:13-8
=5 cm
a.
b.
c.
d.
e.
5cm 3 cm
Perimeter= 13 cm Perimeter= 13 cm5cm
3 cm 2 cm
3 cm
Exercise 4: Solving Word Problems on Length
a. There are 4 poles located in equal distance from each other. If the distance between the first pole and the last pole is 9 km, what is the distance between the poles in meters.
w w w w9 km
? _ m ? _ m ? _ m
Exercise 4: Solving Word Problems on Length
b. The length of a harvest field is 60 wah. Find the length of one and a half of it in meters.
60 wah
Figure BFigure A
? m
Exercise 4: Solving Word Problems on Length
c. A cable wire with the length of 4 km is cut into 6 equal pieces. What is the length of each piece in meters.
4 km
? m? m? m? m? m? m