Answer: Take the information given in the situation. Consider the relationships between the amounts, numbers and unknowns that are in the description.
If the word "is" or "are" is included in the description, that is equivalent to an equal sign.
Words like "and," "also" "more than" and "combined" are clues that there may be addition. "Total" often means the sum of an addition equation.
"From" and "difference" are clues that there is subtraction.
"Times" "by" and "of" art clues for multiplication. "Find the Area of. . ." dedinitely requires multiplication.
"Ratio," 'into' "per" and "among" are clues to division.
Use a letter x, y, d, t, or whatever helps identify the
Step-by-step explanation: Without a specific situation, it is impossible to give a specific answer.
Examples: The total number of seats in the auditorium <em>is</em> 125. 75 tickets have been sold already. How many<em> more</em> tickets are left. (This is the unknown)
The Total <em>is </em>the given 75 plus the unknown.
125 = 75 + x is the equation to start with
What is three-fourths <em>of </em> twelve? "What" is the unknown.
x = 3/4 × 12 is the equation to start with.
The <em>ratio</em> of red marbles to blue marbles is 2:3 There <em>are</em> 25 marbles all together. How many red marbles and how many blue marbles.
In this question there are two equations
2r + 3b = 25 This is the equation for the total r = 2b/3 is the division
Substitute the value of "r" from the second equation to solve the first equation
2(2b/3) + 3b = 25
