Big Ideas Math: Modeling Real Life, Grade 7
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Big Ideas Math: Modeling Real Life, Grade 7 View details
4. Percents of Increase and Decrease
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Exercise 6 Page 257

- 0.696

Practice makes perfect

Before we find the exact sum, let's simplify it using the Commutative Property of Addition.

- 4.621 + 3.925
3.925+(- 4.621)
3.925- 4.621
Notice that this difference will be negative — we are subtracting a greater number from a smaller number. Instead, let's subtract 3.925 from 4.621 and add a negative sign at the end. 3.925- 4.621 =- (4.621-3.925) To subtract decimals, we line up the decimal points so that place-value positions correspond.

Now we subtract the decimals just as we would with whole numbers and place the decimal point in the answer.

Subtraction

We found that the difference between 4.621 and 3.925 equals 0.696. - (4.621-3.925)=- 0.696 This means that the given sum is equal to - 0.696.