1. The smaller number is \(248:2-1=123\). 

2. The least natural number is \(0\)

4. There different is: 40

(Explaination) We have the smallest 3 digit number is 100.

The smaller number = 100 : (3+7) . 3 = 30

The bigger number = 100 - 30 = 70

Their difference = 70 - 30 = 40.

1. Call two consecutive odd number is :

2k + 1 ; 2k + 3

We have :

\(\dfrac{\left(2k+1\right)+\left(2k+3\right)}{2}=248\)

=> 4k + 4 = 2.248

=> 2k + 2 = 248

=> 2k =  246

=> k = 123

So , two consecutive odd number is :

2k + 1 = 2.123 + 1 = 246 + 1 = 247

2k + 3 = 2,123 + 3 = 246 + 3 = 249