Advantages and disadvantages of abacus and hand-held calculator

Abacus:

Advantages:
1.Using abacus can help you improve comprehension in math.
2.Using abacus can help you building up better and faster calculation skills.
3.Using abacus can help you improve problem solving skills.
4.Using abacus can help you improve memory.
5.Using abacus can help you improve confidence in math.

Disadvantages:
1.It takes a lot of room in your back pack. It is hard to carry to class.
2.It takes too long to calculate.
3.It is hard to learn.

Hand-held calculator:

Advantages:
1.Using hand-held calculator can allow you to do calculations faster.
2.Using hand-held calculator can allow you to successfully complete more difficult calculations.
3.Using hand-held calculator can give you confidence when you are doing difficult problems.
4.Using hand-held calculator can help you focus on the problems, not the calculations.
5.It is really easy to carry to class, it doen't take a lot of room in your back pack.

Disadvantages:
1.Using hand-held calculator may give you a false sense of confidence in your calculation abilities.
2.Using hand-held calculator might inhibit your ability to do even basic calculations in your head or on paper.