Question

Maria was recognised for her social work. She was awarded $\$90$ in the prize money. She donated $\$35$ to a charity from her reward money. How much prizemoney does she have left with?

• A. $\$55$
• B. $\$45$
• C. $\$35$

Answer 1

The correct option is A $\$55$

Out of $\$90$ reward money, Maria donated $\$35$ to a charity that means $\$35$ are reduced from her reward money of $\$50$.
The money left with her is $\$90-\$35$

Here, in number 90, digit 9 is nine tens that is equal to $\text{eight ten}+\text{one ten}=\text{eight ten}+10\text{ones}$.

We can borrow 10 ones (or one ten) from 9 tens to add with 0 ones of number 90.

In this way, we will have 10 ones in place of 0 ones and 8 ten in place of 9 tens of number 90.
We can do subtraction as follows:

Here, $10\text{ones}-5\text{ones}=5\text{ones}$
and $8\text{tens}-3\text{tens}=5\text{tens}$

Hence, Maria has $\$55$ of reward money left with her.