Answer

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**Hint**: As we know that when we combine numbers and variables in a valid way, using the operations such as addition, subtraction, multiplication, division, exponentiation and other operations and functions then the resulting combination of mathematical symbols is called a mathematical expression or fundamental arithmetic operations. Here we have been given a mathematical expression with a term where we have to subtract the value.

**Complete step by step solution:**

Here we have to solve the value of $ 90 - 19 $ .

We should know that the word minus, less, difference, decrease, take away and deduct means all the same which is that one quantity is to be subtracted from another quantity.

So when we subtract $ 90 - 19 $ , we get the value $ 71 $ .

We can also read it as ninety minus nineteen is equivalent to seventy one.

Hence the required answer is $ 71 $ .

**So, the correct answer is “71”.**

**Note**: We should keep in mind that subtraction sums are just opposite of addition sums. Our choice of subtraction method depends on the number involved. In order to solve problems with subtraction, we can use addition as subtraction in the inverse process. We can write the above expression also as $ 71 + 19 = 90 $ . So we can solve this also by assuming the required number. Let the number be $ x $ , so we can write that $ x + 19 = 90 $ . Now we can transfer $ 19 $ to the right hand side i.e. $ x = 90 - 19 $ . It gives us the same expression as a question. Therefore the value is $ x = 71 $ .

It should be noted that a mathematical expression does not involve any equal sign as it is an expression. We equal signs $ \left( = \right) $ in mathematical equations not in expressions.

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