Help me pls?? I cant even do simple mental sums??

Question

e.g>> 100 - 59.60=
50 - 26.10=

Help !! i cant do this sum mentally........
Can somebody help me pls??
I am 15 yrs old..........
Is there any problem with me?
Are there easily ways/method to do it??

Answer 1

The way I handle sums like these in my head is to break them down into easier sums. Normally instead of
x-y
I would say
x-z+z-y.
For instance
Let x=100
and y = 59.60
Let z=60 (say)
so now we have
100-59.60
=100-60+60-59.60
= 40 + 0.40
= 40.40
It's a lot easier to see what 100-60 and 60-59.60 is than to do it in one step.

For your other example
50-26.10
=50-27+27-26.10
= 23+0.90
= 23.90.

z can be any value you like as long as you remember to add it and subtract it, it doesn't change the sum.

Answer 2

Never mind these two sums which you have found difficult, but should have mastered about 5 yrs ago. Maybe you really had not been taught the basics of subtraction, 'carrying' a 10 to the top number when it is smaller than the bottom one, and given lots and lots of exercises using smaller numbers.
You must try these first, on your own or with a family member or teacher::
10 - 9. 5 which is the same as 10.0
- 9.5 Ans: 0.5
---------
0.5
----------

20 - 15. 6 which is same as 20.0
- 15.6 Ans:4.4
--------
4.4
--------

Can you figure out how i got the above answers. Be patient and try several times. Once you GOT IT! proceed to the bigger numbers. You will benefit more this way. Best of luck!!!

Answer 3

It might help you to break it up into three steps. First break up the 59.60 into two parts. Then subtract each part separately.

59.60 = 59 and .60

100 - 59 = 41

41 - .60 = 40.40

Try it with the other problem and see if it works for you.

Answer 4

The easiest way would be to subtract 59 from 100 first. 41. Then subract .60 from 41...40.40 Next, subract 26 from 50. 24. Then subtract .10 from 24...23.9

Answer 5

My daughter is also 15 and has a learning disability related to numbers and math. She had a problem doing simple addition in her head, and don't even talk about subtraction. She's in special ed math now.

How about your math grades and scores throughout prior years? Have you had problems with math? Have you ever been evaluated thru your school or other source for a learning disability? Talk to your math teacher AND your parents and tell them exactly what you wrote above.

Answer 6

if you think that you should do this and still you can't do it, then try harder till you can.