The expression "five times the sum of a number and -23" can be written as:

$5 \times (x + (-23))$

This simplifies to:

$5 \times (x - 23)$

where $x$ represents the unknown number.

Would you like a detailed explanation or have any questions?

Here are 5 related questions to explore this concept:

1. How do you solve for $x$ if given a value for the expression $5(x - 23)$?
2. What happens if you expand the expression $5(x - 23)$?
3. How would you solve the equation $5(x - 23) = 10$?
4. Can you create an equation where this expression equals 0 and solve for $x$?
5. How would the expression change if instead of subtracting 23, you added 23?

Tip: Always remember to distribute multiplication over addition or subtraction when dealing with expressions like this.