Question

Mrs. Zamir wants to buy 8 protractors and some erasers for her classroom.She has $30.00. If protractors cost $2.65 each, how much will Mrs. Zamir have left to buy eraser??

Answer 1

Mrs. Zamir has $\fbox{\bf\ 8.8}$ left to buy eraser.

Further explanation :

Multiplication is a mathematical operation such that two real numbers are performed in such a way that they derive a third number called product.

For example:

There are two numbers $4{\text{ and 5}}$ then multiply both the numbers as,

$4\times5=20$

Therefore, 20 is the product of 4 and 5.

It is given that Mrs. Zamir wants to buy 8 protractors and some erasers for her classroom.

She has total $\ 30$.

If the price of the protractor is $\ 2.65$ each.

Therefore, she spends total amount of money  on protractor can be calculated by multiplying 8 protractors by 2.65 as,

$\begin{aligned}n&=8\times2.65\\&=21.2\\\end{aligned}$

Thus, she spends $\ 21.2$ on protractors.

Now, she has total $\ 30$ and $\ 21.2$ she spends on protractors.

Therefore, she left with the amount $r$ as,

$\begin{aligned}r&=30-21.2\\&=8.8\\\end{aligned}$

Therefore, she has $\fbox{\bf\ 8.8}$ amount left for eraser.

Learn more :

1. Problem on the whole numbers are positive integers brainly.com/question/1852063.

2. Problem on the adding and simplifying the numbers brainly.com/question/894273.

3. Problem on the general form of the equation of the circle brainly.com/question/1506955.

Answer details:

Grade: Junior school

Subject: Mathematics

Chapter: Multiplication and division

Keywords: Mrs. Zamir, protractors, erasers, cost, multiplication, division, addition, subtraction, real numbers, decimal numbers.

Answer 2

Mrs Zamir has $8.80  

This is a practical multiplication and subtraction question

Further Explanation

Multiplication is a mathematical process where two or more numbers are multiplied to give a final number which is also known as a product. For example, a product, 100 is derived from two or three numbers i.e. 25 x 4 = 100; 5 x 5 x 4 = 100.

Subtraction is a mathematical operation where two or more numbers are calculated in a reducing from to give a final number. For example, 50 – 40 = 10; 50 – 20 – 20 = 10.

Solving the given question:

Mrs Zamir has $30.00, Let Total amount = T

Therefore, T = 30

She needs to buy 8 protractors and some erasers for her classroom.

If protractors cost $2.65, then  

Total cost of protractors will be multiplying the protractors cost by the number of protractors needed which is 8

Let the Total cost of protractors =Y

Therefore Y = $2.65 X 8  

Y = 21.2

To get the remainder of what Mrs Zamir has left, subtract Y from T i.e. (T – Y)  

Let the remainder = R

R = T – Y  

R = 30 – 21.2

R = 8.80

Therefore, Mrs Zamir will have $8.80 left to buy erasers

KEYWORDS:

• protractors
• erasers
• multiplication
• addition
• subtraction