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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




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


October 9, 2016

what is 2/5 + 1/2

Gane - USA



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


March 2, 2016

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

laisenia - Fiji



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

+ 2.50

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Combine two expressions

Topic: General


November 24, 2015

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

Adu - Ghana



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


November 20, 2015

Convert 20 base 2 to base 10

Oyetunde - Nigeria



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


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



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


May 7, 2015

3/7 + 5/7 as a fraction?

Tony - UK



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


September 21, 2012

Fraction 3/4=?/100

leola - South Africa



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


September 15, 2012

How do u calculate distance ?

Thulane - Mpumalanga



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


March 7, 2012

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

aya - Canada



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


February 8, 2012

what is meant by tignometry

sai - India



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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