Question

Wasim sold books for $15$ days, selling $10$ books each day. Akram sold books for $10$ days, selling $15$ books each day. Who sold more books? Do not

solve actually. Use a property to answer and also name the property used.

Answer 1

Step $1$; Find number of books sold by Wasim.

Let, a $=$$15$ and b $=$ $10$

Then, a $\times$b $=15\times 10$ …………..$\left(1\right)$

Number of books sold by Wasim.$=15\times 10$

Step $2$; Find number of books sold by Akram.

Let, a $=$$15$ and b $=$ $10$

Then, b $\times$ a $=10\times 15$ ……………..$\left(2\right)$

Number of books sold by Akram $=10\times 15$

Step $3$ Compare

From equation $\left(1\right)$ and $\left(2\right)$

a $\times$b $=$ b $\times$ a

We, notice that in both the cases the multiplication is carried out by multiplying the numbers $15$ and $10$

So, the result is same.

Thus, Wasim and Akram sold the same number of books

and Commutative property of Multiplication is used.