Write, Read, and Evaluate Expressions in Which Letters Stand for Numbers

Which of the following uses a placeholder symbol to represent an unknown number?

Which operation does the word 'product' describe?

If $x = 4$, what is the value of $x \times 3$?

Which expression represents 'the sum of $n$ and 7'?

Which expression represents 'subtract $y$ from 5'?

In the expression $4x + 9$, what is the coefficient of $x$?

Evaluate $3x + 1$ when $x = 5$.

Evaluate $3 + m^2$ when $m = 6$.

Which verbal phrase matches the expression $10 - k$?

Write the algebraic expression for each phrase.

'The quotient of $n$ and 4' is written as   ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲   .

'Eight more than twice a number $x$' is written as   ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲   .

Which statement correctly describes the expression $3x + 5$?

In the expression $2(8 + 7)$, which statement correctly describes the structure?

Evaluate $a^2 - 2b$ when $a = 4$ and $b = 3$.

A store sells notebooks for $n$ dollars each.

The expression for the total cost of 4 notebooks is   ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲   .

If $n = 2.50$, the total cost is   ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲   .

A rectangle has length $l$ and width $w$.

The expression for its perimeter is   ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲   .

When $l = 8$ and $w = 3$, the perimeter is   ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲   .

What error did Priya make?

What error did Marcus make?

Evaluate the expression below when $a = 3$ and $b = 5$.

$\frac{a^2 + b}{2a - 1}$

The expression $4(2x + 1)$ can be described in two ways: as a single product, and by looking at the structure inside the parentheses. Describe the expression at both levels using correct mathematical vocabulary.