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Arithmetic Feedback

by Ron Kurtus

Readers have sent in a total of 19 comments and questions on Arithmetic issues. They are listed according to date.

You can read them to further your understanding of the subject.



List of most recent 15 letters

Title

Topic

Country

Adding two fractions Fractions USA
 
Sum of numbers Numbers Fiji
 
Combine two expressions General Ghana
 
Convert 20 base 2 to base 10 Numbers Nigeria
 
Filling a can with water General Ghana
 
Sum as a frction Fractions UK
 
Change 3/4 to ?/100 Fractions South Africa
 
Calculate distance General Mpumalanga
 
Can you help me on my math lessons? General Canada
 
What is trigonometry? General India
 
What is arithmetic? General India
 
Fraction has multiple instead of addition Fractions South Africa
 
I have problems in math General USA
 
Algebra problem with trains General India
 
Is zero a negative number or positive number? General USA
 

Next 15 letters

 





Fractions

Adding two fractions

October 9, 2016

Question

what is 2/5 + 1/2

Gane - USA (27355)

Answer

To add 2/5 + 1/2, you find the lowest common denominator, which would be 5 x 2 = 10.

Then change each fraction to have the same denominator: 2/5 = 2*2/5*2 = 4/10 and 1*5/2*5 = 5/10.

Finally: 4/10 + 5/10 = 9/10.

Follow a similar routine for adding other fractions.

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Numbers

Sum of numbers

March 2, 2016

Question

sum of the measured value;756, 37.2, 0.83, and 2.5

laisenia - Fiji (26834)

Answer

This is an Arithmetic problem that you can do with a calculator or by hand. Put all as decimal numbers and add:

756.00
37.20
0.83
+ 2.50
-------
796.53

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General

Combine two expressions

November 24, 2015

Question

Evaluate (2x - y)*2 + ( 4x -3y)*2 where * is an exponent oor power

Adu - Ghana (26561)

Answer

Note that ^ is usually used to denote raising to a power

(2x - y)^2 = (2x - y)(2x - y) = 4x^2 - 4xy + y^2

(4x - 3y)^2 = (4x - 3y)(4x - 3y) = 16x^2 - 24xy + 9y^2

You can then add like terms.

See Multiplying Binomial Expressions in the Algebra section for more information.

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Numbers

Convert 20 base 2 to base 10

November 20, 2015

Question

Convert 20 base 2 to base 10

Oyetunde - Nigeria (26551)

Answer

The base 2 only uses the digits 0 and 1, so 20 is not possible. However, you can convert 20 base 10 to base 2 as: 10100.

You can use a conversion calculator to check this as well as to try other numbers.

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General

Filling a can with water

October 8, 2015

Question

A jerry-can is 2/5 full of water. if 15 litres is added to fill it up, how many litres can the tank hold?

Adu - Ghana (26426)

Answer

This is actually an Algebra problem.

If X is the full amount, and the can is 2/5 full, then the empty part is 3/5.

So (3/5)X = 15 litres. Thus, 3X = 75 and X = 25 litres.

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Fractions

Sum as a frction

May 7, 2015

Question

3/7 + 5/7 as a fraction?

Tony - UK (25978)

Answer

Since the bottom numbers (denominators) are the same, you simply add the top numbers (numerators): 3/7 = 5/7 = 8/7.

However, 8/7 is an improper fraction and should be reduced to 1 1/7.

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Fractions

Change 3/4 to ?/100

September 21, 2012

Question

Fraction 3/4=?/100

leola - South Africa (22934)

Answer

Since 4 times 25 = 100, multiply 3/4 times 25/25 = 3*25/4*25 = 75/100

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General

Calculate distance

September 15, 2012

Question

How do u calculate distance ?

Thulane - Mpumalanga (22900)

Answer

To calculate the distance, you need to compare with some source. it depends much on what you are trying to do.

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General

Can you help me on my math lessons?

March 7, 2012

Question

hi can you help me on my math lessons. i would apreasheat that im in grade 6

aya - Canada (22489)

Answer

Take a look at my Arithmetic and Algebra sections. The lessons and mini-quizzes may help with your understanding.

I can answer some specific questions, but can't really give personal help.

Best wishes in doing well in math.

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General

What is trigonometry?

February 8, 2012

Question

what is meant by tignometry

sai - India (22415)

Answer

Trigonometry is a mathematics subject related to geometry. Its primary use is a clever method to measure the size of a large object by comparing distances with a right triangle.

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General

What is arithmetic?

October 15, 2011

Question

What is exactly arithmetic?

Priyam - India (22078)

Answer

Arithmetic is working with numbers, such as counting, adding, subtracting, multiplying and dividing. Dividing breaks numbers into fractions and decimals, which are a sub-set of arithmetic.

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Fractions

Fraction has multiple instead of addition

September 3, 2011

Question

What if a fraction has a multiple in the middle instead of an addition

Lwandisa - South Africa (21943)

Answer

See Multiplying Fractions to see how to do it.

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General

I have problems in math

February 1, 2011

Question

ihave broublems in math so how to be good in this ?
please give me good idias please.

jouliet - USA (21125)

Answer

Take a look at our sections on Arithmetic and Algebra to help you learn the subjects.

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General

Algebra problem with trains

October 2, 2010

Question

Two trains of 100 m each in length running in opposite directions cross each other in 6 seconds. If the speed of one train is 48km/hr, find the speed of another train.

Rupesh - India (20476)

Answer

That is a good Algebra problem, not an Arithmetic problem. I think some data is missing.

Sorry we do not have the solution.

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General

Is zero a negative number or positive number?

June 3, 2010

Question

hello sir, good morning,
my name is irfan i am the student of class 6.
please help me and give me answer.

zero is the negative number or positive? why all the things becomes zero when multiplied with zero?

irfan - USA (19831)

Answer

For a long time zero was not even considered a number, because it represents nothing. Zero is the turning point between positive and negative numbers, so it is neither positive or negative.

Positive is defined as greater than zero and negative is defined as less than zero.

Multiplying by nothing results in nothing. Thus multiplying by zero results in zero.

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