If a and B are two points on the number axis, the number corresponding to point a is - 20, and the number corresponding to point B is 100 (1) Please write the corresponding number of point m in ab

If a and B are two points on the number axis, the number corresponding to point a is - 20, and the number corresponding to point B is 100 (1) Please write the corresponding number of point m in ab

100-(-20)=120,
120÷2=60,
The corresponding number of point m in ab
100-60 = 40, (B moves 60 basic units to the left),
Or - 20 + 60 = 40, (a moves 60 basic units to the right)