Which expression is the exercise 29X28 equal to?
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Which expression is the exercise 29X28 equal to?
We begin by breaking down 29 into a subtraction exercise:
We then multiply each term inside the parentheses by 28 and we obtain the following:
Let's observe the multiplication exercise on the right and remember that each term multiplied by 1 is equal to the term itself.
That is:
30X28 less 28
\( 140-70= \)
Breaking 29 into 30-1 makes multiplication easier because 30 is a round number! You could use 20+9, but multiplying by 30 is much simpler than multiplying by awkward numbers.
The distributive property says . So . We distribute the 28 to both terms inside the parentheses.
That works too! But this question is testing whether you understand equivalent expressions. The factorization method shows you can break complex multiplication into easier steps.
The multiplicative identity property states that any number times 1 equals itself. So , making our final expression .
Look for the expression that matches your factorization: . The correct answer shows 30×28 less 28, which means subtraction.
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