Answer: the difference between two numbers can be obtained by subtracting the smaller number from the bigger number. 
 
• Here, - 0.4 is the smaller number, and 44.4 is the larger number. 
 
• Therefore, the difference between the two is 44.4 - (- 0.4). 
 
• Now, in mathematics, - and - makes a +. 
 
This implies that, 44.4 - (- 0.4) = 44.4 + 0.4 = 44.8 
 
∴ The required difference is 44.8. 
 
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