







calcul des hh,mn,sec 
20080119 

gillot pose la question : bonjour, mon fils à des additions et soustractions d'horaire et je n'arrive pas à trouver
la règle pour lui espliquer comment il faut faire
il y a t il une formule pour les additions et soustractions
merci par avance pour vos réponses Claude Tardif lui répond. 





A=B+C+D+F+G+H+J 
20071127 

Boubendir pose la question : voila ma question et comme savoir les nombres additioné en etulisant le resultat
A=B+C+D+F+G+H+J
au debut ons a les B,C,D,F,G,H,J on connaissent leur valeur comment retrouver
valeur on etulisant leur resultat Claude Tardif lui répond. 





Gauss' Addition of whole numbers. 
20180430 

Brad pose la question : I found this on your site. Question: what is the sum of the first 100 whole numbers??
Is there a different formula if the numbers begin at a number other than one? For example
What is the series I want to add is goes from 7  53? Harley Weston lui répond. 





Adding two negatives 
20180204 

Pinasshakoane pose la question : (23)+(3) Penny Nom lui répond. 





Multiplication and repeated addition 
20161123 

Anandmay pose la question : Hello
I was looking closely at early arithmetic where I found how we discovered properties of Arithmetic.
Like:2 x 3 = 3 x 2.
This can be proved by considering a 2D figure(actually,quadrilateral) having length consisting of 2 boxes of
1by1 dimensions and breadth of 3 boxes of the same dimensions.
Now,consider it again,but,this time,length of 3,and breadth of 2 of such 1 by 1 boxes.
We now notice that we can fit the 2 types of rectangles formed on each other precisely.
So the multiplicative property of commutativity is true for all natural numbers as we can generalize the result(in our mind,for self satisfaction).
Now,can you find me a nice satisfactory reason of why a fraction times a natural number equals the number times the fraction?
I mean, for example,i can understand the meaning of 3 x 2/3 to be three times 23rd,that is, 2/3+2/3+2/3.Fair enough.
But here is the problem:By definition and actual meaning of multiplication, a x b means the repeated sum of b,done 'a' times.
So what is the meaning of doing 2/3 x 3?The repeated addition of 3 how many times??2/3 times??Not making sense,right?And even
we have not proved yet the commutative property of numbers INCLUDING fractions.So how can we resolve this problem and make these things meaningful?
Thanks Penny Nom lui répond. 





Complex numbers in standard form 
20160115 

Michael pose la question : express the following complex numbers in standard form (2+3i)+(52i) Penny Nom lui répond. 





Multiplication and order 
20110121 

Janet pose la question : IN A MULTIPLICATION SENTENCE BASED ON A DRAWING..IS THERE ANY ORDER FOR THE MULTIPLICAND ANG MULTIPLIER FOR THE ANSWER TO RIGHT? Robert Dawson lui répond. 





Convert to multiplication 
20101023 

angelina pose la question : how to covert 5+5+5=15 to multiplication Penny Nom lui répond. 





4.5 PLUS 29 
20100907 

kiona pose la question : 4.5 PLUS 29 Penny Nom lui répond. 





Adding in base six 
20090329 

Lucy pose la question : If you are working in base 6,
what do you have to add to 4(base 6) to get 10(base 6)???? Penny Nom lui répond. 





Adding fractions 
20080917 

amanpreet pose la question : please can you help me to simplify:
2(c3) / 7 + 3(4c2)/2 Penny Nom lui répond. 





.9 repeating plus .2 repeating 
20080610 

megan pose la question : How do you express the addition of .9 repeating plus .2 repeating? Penny Nom lui répond. 





Adding rational functions 
20080429 

Jonathon pose la question : 1/(x+3) + 1/(x^2+5x+6) = Penny Nom lui répond. 





Base 5 arithmetic 
20080306 

Jana pose la question : Hello, my name is Jana, i have asked a question here previously about how to count in base5. I am happy now because i can convert any number now and it is very easy for me. The only thing i am having trouble with is understanding how to do a maths sum or times base5 numbers. it is just a bit hard for me. So do you think you could explain how to do a sum in base5 and how to do a multiplication sum. Please help...Thankyou Jana!! Harley Weston lui répond. 





Adding fractions 
20071231 

Lisa pose la question : As an educator in Adult Education, I am preparing a young man for a US Government test. The equation I have trouble with is explaining the following equation. It asks: If it takes A 3 days to dig a certain ditch, whereas b can dig it in 6 days, and C in 12, how long would it take all three to do the job? I know the equation is 1/3 + 1/6 + 1/12 and it equals = 7/12 but I don't understand how it equals 7/12. This simple math eludes me. So the question is not the final answer of 1 and 5/7 of days but where one comes up with the 7/12? Penny Nom and Claude Tardif lui répond. 





Linear systems 
20060921 

Alexander pose la question : Hello, i have a math assignment due tonight at midnight and i need some help please
It is using the addition method to solve linear systems Penny lui répond. 





1/x + 1/y 
20060811 

Sonya pose la question : what is 1/x+1/y = ? is it equal to 1/x+y or what? Penny Nom lui répond. 





Adding polynomials and counting the terms 
20060428 

Kris pose la question : Suppose that two polynomials, each containing 3 terms, are added. Is it possible for the sum to contain more than 3 terms? fewer than 3 terms? exactly 3 terms? Explain. Leeanne Boehm and Steve La Rocque lui répond. 





Adding 10 and multiples of tens to one and two digit numbers 
20051213 

Meghan pose la question : I am teaching in a grade 2/3 class and I am struggling with trying to find a simple way of explaining to the students how to add 10 and multiples of tens to one and two digit numbers. Diane Hanson lui répond. 





Adding fractions 
20031116 

Ken pose la question : My name is Ken and I am taking my GED course for my High School and have not been in a class for 35 years. I am doing this for retraining. I am at the part about fractions. Here is an example that I am having trouble with.
1 3/7 + 4 2/3 + 11/21
They have no common denominators. Could you PLEASE help me. If you could send me a step by step explanation it would be greatly appreciated. Penny Nom lui répond. 





Common Denominator 
20020826 

Slobodanka pose la question : What is a Common Denominator? Penny Nom lui répond. 





Adding algebraic fractions 
20020320 

Dolores pose la question : I get totally confused with this problem. I get confused with the getting the lowest terms. 4/x5 + 2/x 10/x^25x Penny Nom lui répond. 





F = 3 + 3 
20020319 

Jessica pose la question : F= 3 + 3 WHAT IS F????? Penny Nom lui répond. 





Adding algebraic fractions 
20020123 

Francine pose la question :
Hello, I've come up with an answer for the following problem but it's not the same as the book's answer. However, the book has a lot of mistakes in it and I don't know if I'm doing it properly or not. Your help would be soooo appreciated. It's driving me crazy.The problem is:
2 + 3 + 4
 +  + 
(x1)^3 (x1)^2 (x1)
[(x1)^3 is (x1) to power of 3 etc.] Penny Nom lui répond. 





Adding vectors 
20020112 

Lena pose la question : how do you add vectors together? If you are given the length and angles of both vectors and are asked to add/subtract them, how do you do it? I know you are supposed to do the head to tail method, but whenever i try it i get the wrong answer. I need help setting it up. example: A is 2.7cm, and 60 degrees, B is 1.6cm and 135 degrees, find the magnitude and amplitude Penny Nom lui répond. 





Odd plus even is odd 
20011014 

James pose la question : Why is the sum of an odd number and an even number always odd? Peny Nom lui répond. 





Adding functions 
20010219 

Jackie pose la question : f(x) = x^{2} + 1; g(x) = x^{2}  1 find a) ((f+g) of h)) (x) b) ((fg) of h)) (x) c) ((f of h)  (g of h)) (x) Penny Nom lui répond. 





What is wrong with these probelms? 
20010209 

Cindy pose la question : Hi, I am a planning on becomming a teacher and i am asked to find out what is wrong with these probelms and how i would go about showing a student what is wrong with them!! Error in patterns: 13/35=1/5; 27/73=2/3; 16/64=1/4 4/5+2/3=6/8; 2/5+3/4=5/9; 7/8+1/3=8/11 2/3*3=6/9; 1/4*6=6/24; 4/5*2=8/10 Leeanne Boehm and Penny Nom lui répond. 





Order of operations 
20001126 

Margaret Pratt pose la question : My daughter has a math question and I am afraid I am of no help. Can you help? 2x5/2+15= She arrives at 8 as the answer and has been told this is incorrect. Any help you can give would be appreciated. Penny Nom lui répond. 





Word addition 
20000705 

Harman Chaudhry pose la question : What is the value of DISHES if SEE + THE + WAITER + WASHES = DISHES. In addition, I know there is a name for these types of problemswhat are they actually called? Chris Fisher lui répond. 





Why does division start from the left? 
20000524 

Salil Dave pose la question : Addition, subtraction and multiplications start with right most digit and proceed left, but division starts from leftmost digits and goes right ... why? Harley Weston lui répond. 





Adding fractions 
20000423 

A grade 6 student pose la question : In adding fractions, how do I rewrite the fractions so that the denominators are equal? The problem is 3/4 + 1/6 = The other problem is 11/18 + 4/9 = Penny Nom lui répond. 





Addition 
20000111 

Deanna pose la question : what is the answer for 20+5+323+98 Penny Nom lui répond. 





A number between 
19981125 

Jimmy Nikola pose la question : A number is less than 3,425 + 8,630 and greater than 7,614 + 4,429. What could the number be? This question is on page 93, question number 23. in Silver Burdett Ginn Math book, which is a 3rd grade math book. Jack LeSage lui répond. 





Adding Fractions 
19981015 

Lindsay pose la question : please help me!!!! Harley Weston lui répond. 





A Sum or Product of Fractions 
19981006 

Emily Robb pose la question : Find a pair of fractions that when they are multiplyed and added the sum /product is the same Penny Nom lui répond. 

