Math Student Help

Suppose you are asked to design a software tool that helps an elementary school student learn
arithmetic operations. The software allows the student to select the arithmetic operation she or he
wishes to study. The student chooses from a menu one of five arithmetic operations: 1) addition,
2) subtraction,(other arithmetic operations have not been include to keep the problem simple).
Based on the student choice, the software tests the user with exactly 10 questions. For each
question, two random positive one-digit integers are generated; then the student is asked to enter
the answer for the arithmetic operation applied to the two numbers.

The software displays a message “Congratulations!” if more that 7 questions are answered
correctly, otherwise, the program should display "Please ask your teacher for help".

What I would do after getting the input from the user as to what operator they want to use, and checking that the input is valid, is:

- do a loop of 10 for each of the 10 questions.
- - get the 2 random numbers.
- - then do a switch on the inputted operator.
- - - according to which operator, generate the answer.
- - - ask the user to answer.
- - - compare the users answer to the generated answer.
- - - update the amount of correct answers if it is correct.
- - end switch.
- end loop.

OR

- do a loop of 10 for each of the 10 questions.
- - get the 2 random numbers.
- - then do a switch on the inputted operator.
- - - according to which operator, generate the answer.
- - end switch.
- - ask the user to answer.
- - compare the users answer to the generated answer.
- - update the amount of correct answers if it is correct.
- end loop.

Then check the amount of correct answers to output the message of congratualtions or not.

Good luck with it.

I am looking for something he can click on by himself at least 30 min a day before he starts playing or watching cartoon network. Thx.

firstgrademath.com

Write a paragraph that explains in your own words how to change subtraction into adding the opposite. Use examples to help you explain this. Type your answer into a text file.

5 - 2 = 3

5 + (-2) = 3

This holds true since -2 is the opposite of 2. Hope this helps start the paragraph in your own words.

Is subtraction of real numbers commutative?

does 4-3 equal 3-4?

The homework worksheet says for them to use compatible numbers to subtract the two and three-digit numbers. I know how to add with compatible numbers, but how do you subtract?

I am not sure but I would think it means rounding numbers making it easier to subtract such as 28 subtract 17 would be 30 - 20 but I am not 100% sure. Sorry.

these are the numbers: 6954988. My husband says there isn’t a way to get the to equal 23, but I did it and forgot to write it down. So can it?

6+9+5+8+8-9-4=23

can you show me an example

Normally, you’d use both. In fact, one of the biggest tools is the distributive property of multiplication over addition, where you pull out common factors.

Examples:

3x + 6x = (3+6)x = 9x — a simplification.

2x + 4y = 2(x+2y) — that’s not a simplification itself, but it may be a step in simplifying a fraction.

So like 1+2+3+4=10 so if you use 1,2,3,4 and +, -, x, and divison how do you get 7?

((((-1)+2)*3)+4) will do it.

I need help please.. Explain why the set of real numbers is not commutative under division?

to be associative under subtraction:

a - (b - c) = (a-b) - c

but since

a - (b - c) = a - b +c, that doesn’t hold - so real number are not associative under subtraction.

to be commutative under division:

a / b = b / a - clearly not true

Does anyone know the Trachtenberg method for rapid subtraction? If so can you please post the details? I need to improve my rapid sutraction technique for four digit numbers.

As far as i go, the Trachtenberg method applies only to multiplication.
Try Vedic Mathematics.