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To make it easier for us to solve, we will use the divisibility rule by 19:
Let's multiply 99 by each term in parentheses:
Let's solve the expression in the first parentheses:
We'll separate the expression in parentheses in a way that uses the divisibility rule by 99:
Let's multiply 9 by each term in parentheses and we get:
Let's solve each of the expressions in parentheses:
Let's solve the expression from left to right.
We'll solve the left expression by adding vertically:
We'll make sure to follow the correct order when solving the expression, ones with ones, tens with tens, and so on, and we get:
Now we get the expression:
\( 140-70= \)
Breaking numbers apart using the distributive property makes calculations easier! is simple, and can be calculated step by step.
Write down each step clearly: and . Then add: 990 + 891 = 1,881. Don't skip the intermediate steps!
Absolutely! For any multiplication like , you can split it into . This works great for mental math!
Go back and recalculate each partial product separately. The most common errors happen in or when adding the final results together.
Yes! Think of 99 as (100 - 1), so . Both methods give the same answer!
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