MODUL 1
Unit 2
OPERATION OF INTEGERS
A. Mental Mathematics
Mental mathematics or mental calculation is often used in daily life.
There are several techniques for doing calculations mentally.
1. Properties (commutative, associative, and distributive)
2. Compatible numbers
3. Compensation
4. Left-to-right methods
B. Estimation with integers
There are two types of computational estimation
Front-end Estimation and Rounding
Front-End Estimation
1. Range estimation
2. One-column
3. Two column front-end
4. Front-end with adjustment
Rounding
Rounding is the best known computational estimation technique.
The purpose of rounding is to replace complicated numbers with simpler numbers.
There are four types of rounding estimation
1.Round up ( down )
2.Round a 5 up
3.Round to the nearest even
4.Round to Compatible numbers
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