1. Estimation in numbers and measurement
Form 1 Mathematics
Chapter 5
Estimation in numbers and measurement

2. Reminder Lesson requirement Before lessons start Textbook 1A
Workbook 1A
Notebook (and folder)
Before lessons start
Desks in good order!
No rubbish around!

3. Estimation (p.189)
An estimation is a rough guess on the actual values.
It does not represent the real answer.
In real life, we seldom bring a calculator with us. So, we can use estimation to make some decisions.
To get a better estimation, we need some techniques to round off a number.

4. Estimation on measurement
Benchmark Strategies
Have reference
Decomposition-recomposition Strategies
Break into small, count, guess back the whole
Measuring Groups of objects
Measure large amount, then divide
Using Formulas
Calculate, then estimate
Using Graph Papers
Count squares: Full, > Half, < Half

5. Time for Practice Pages 209 – 211 of Textbook 1A
Questions 1 – 10
Pages 97 – 98 of WB 1A
Questions 1 - 7

6. Reminder Lesson Desk SHW (I) OBQ CBQ Get ready all the time!
Be order all the time!
SHW (I)
14 Jan (Mon)
OBQ
CBQ
16 Jan (Wed)

7. Enjoy the world of Mathematics!
Ronald HUI
Enjoy the world of Mathematics!