Question

What’s the error? Reeta evaluated $ - 4 + d$ for $d = - 6$ and gave the answer of $2$. What might Reeta have done wrong?

Answer 1

Hint: First, we have to know about the concept of addition and subtraction operations.
The addition is the summing of two or more than two numbers, or terms, or values, or variables and in addition, if we sum the two or more numbers a new frame of the number will be found, also in subtraction which is the minus of two or more than two numbers or values example $2 - 3 = - 1$ (larger number signs stays constant)

Complete step-by-step solution:
Since from the problem given that Reeta evaluates $ - 4 + d$ for $d = - 6$ which means we have to substitute the given value of $d = - 6$ on the equation $ - 4 + d$ and then we need to evaluate the answer with the subtraction operation because they have clearly given the operation of subtraction.
Let us put the value of $d = - 6$ in $ - 4 + d$ then we get $ - 4 + d = - 4 + ( - 6)$
Since if the two values are negative then they will be added using the addition operation and hence we have $ - 4 - 6 = - 10$ is the answer.
But Reeta gave the answer $2$ because she did the subtraction method wrong.
Let us put the value of $d = - 6$ in $ - 4 + d$ and Reeta may get $ - 4 + 6 = 2$
Since in the subtraction if both the values are in the same sign then we must need to add only, not to subtract the values.
Hence the answer is $ - 10$ not $2$.

Note: If the given values have positive and negative signs then we need to subtract them and put the sign occurring to the larger number of signs.
Since multiplicand refers to the number multiplied. Also, a multiplier refers to the number that multiplies the first number. Have a look at an example; while multiplying $5 \times 7$the number $5$ is called the multiplicand and the number $7$is called the multiplier. Like $ - 4 \times ( - 6) = 24$
The process of the inverse of the multiplication method is called division. Like $x \times y = z$is multiplication thus the division sees as $x = \dfrac{z}{y}$. We usually need to memorize the multiplication tables in childhood so it will help to do mathematics.