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Feedback Q&A on Arithmetic

by Ron Kurtus

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

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



List of most recent 10 letters

Topic

Title

Country

Fractions Adding two fractions USA
 
Numbers Sum of numbers Fiji
 
General Combine two expressions Ghana
 
Numbers Convert 20 base 2 to base 10 Nigeria
 
General Filling a can with water Ghana
 
Fractions Sum as a frction UK
 
Fractions Change 3/4 to ?/100 South Africa
 
General Calculate distance Mpumalanga
 
General Can you help me on my math lessons? Canada
 
General What is trigonometry? India
 

Next 10

 





Adding two fractions

Topic: Fractions

Question

October 9, 2016

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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Sum of numbers

Topic: Numbers

Question

March 2, 2016

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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Combine two expressions

Topic: General

Question

November 24, 2015

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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Convert 20 base 2 to base 10

Topic: Numbers

Question

November 20, 2015

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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Filling a can with water

Topic: General

Question

October 8, 2015

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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Sum as a frction

Topic: Fractions

Question

May 7, 2015

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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Change 3/4 to ?/100

Topic: Fractions

Question

September 21, 2012

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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Calculate distance

Topic: General

Question

September 15, 2012

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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Can you help me on my math lessons?

Topic: General

Question

March 7, 2012

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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What is trigonometry?

Topic: General

Question

February 8, 2012

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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Summary

Hopefully, this reader feedback has helped provide information about Arithmetic issues.


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