Determine the numerical value of the triangle:
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Determine the numerical value of the triangle:
The problem involves solving a simple algebraic equation:
This simplifies to:
The value of the triangle symbol is .
Therefore, the solution to the problem is , which corresponds to choice 4 in the provided list of answer choices.
If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?
Because the equation shows , meaning 7 is being subtracted from the triangle. To undo subtraction, you add the same number to both sides!
The triangle is just a variable like x or y. It represents an unknown number we need to find. Don't let the unusual symbol confuse you!
The standard method is adding 7 to both sides, but you could also think: "What number minus 7 equals 80?" Either way leads to .
Substitute 87 back into the original equation: . Since this is true, our answer is correct!
If you got 73, you probably subtracted 7 from both sides instead of adding. Remember: check your answer by substituting: , so 73 is wrong.
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