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With 3 dollars and 75 cents we will... 1. convert to 375 cents. 2. Now we can divide 375 by 3 and we get 1/3 of 375 which is 125 cents. 3. multiply 125 by 2 so that you get 2/3 which is 250 cents, which is equal to 2 dollars and 50 cents. NOTE: At step 2, you could have multiplied 375 by 2/3 to also get 250 cents.
Three ways.
You mean 1/2 + 1/4? Imagine as quarters from a dollar, ok? Each quarter is 25 cents and if you have two, that makes it fifty. If you have two fifty cents, that makes a dollar (1/2+1/2=1). So, fifty cents plus a quarter is what? 75 cents? Yes.
Think of quarters. 1 quarter 25 cents. 2 quarters 50 percents. 3 quarters 75 cents, and 4 quarters 1 dollar. So, out of 4 quarters its the third so it would be 3/4.
To make 68 cents with 13 coins, you can use the following combination: 3 quarters (25 cents each), 2 dimes (10 cents each), 3 nickels (5 cents each), and 5 pennies (1 cent each). This totals to 75 cents (3 quarters) + 20 cents (2 dimes) + 15 cents (3 nickels) + 5 cents (5 pennies) = 68 cents. This combination uses a total of 13 coins.