Quick Notes

Quick Notes

Mathematics Chapter 1: Rational Numbers
1.4 Positive and Negative Decimals
1.4  Positive and Negative Decimals
 
  • Positive decimals are decimals more than \(0\).
  • Negative decimals are decimals less than \(0\).
 

 
  • The values of two or more decimals can be compared and arranged in ascending order or descending order.
 
Combined basic arithmetic operations of positive and negative decimals:
 
  Example  
     
 

Calculate:

(i)

\(\begin{aligned} &\space(9.37-0.63)\times(-0.4) \\\\&=8.74\times(-0.4) \\\\&=-3.496. \end{aligned}\)

(ii)

\(\begin{aligned} &\space2.34+3.1\div0.2 \\\\&=2.34+(3.1\div0.2) \\\\&=2.34+15.5 \\\\&=17.84. \end{aligned}\)