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## Adding and Subtracting Large Numbers.

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**Adding and Subtracting Large Numbers.**By Scott Mangum**Mississippi benchmark**5a – Adding and subtracting nine-digit whole numbers with and without regrouping.**Vocabulary**• Addends – Are numbers being added. • Sum – Is the answer to an addition problem. • Minuend – Is the number being subtracted from. (top number) • Subtrahend – Is the number being subtracted. (bottom number) • Difference – Is the answer to an subtraction problem. • Regrouping – Is when you borrow a number from a higher place value or carry a number to a higher place value.**Subtraction with regrouping**11 1 6 11 Regrouping/Borrowing 721 - 158 / / / 5 6 3**Addition with regrouping** Regrouping/Carrying 739 + 274 10 1 1 1 3**Practice**• The population of Jackson, MS is 2,844,658. The population of Birmingham, AL is 4,447,100. How many more people live in Birmingham than Jackson? - 2,844,658 4,447,100 1,602,442**The American Red Cross receives donations for different**disasters. The Red Cross received $289,000,000 for the September 11th attack, $173,000,000 for the Indian Ocean Tsunami, and $537,000,000 for the relief efforts for Hurricane Katrina. What is the difference between the tsunami and Katrina? How much money did the Red Cross collect in all? Practice $537,000,000 -$173,000,000 $364,000,000 $537,000,000 $289,000,000 +$173,000,000 $999,000,000**There were 2,725,716 houses built in 2002. In 2003**consumers built 3,010,738 more homes. How many houses were built in 2002 and 2003? How many more houses were built in 2003 than 2002? Practice 3,010,738 +2,725,716 5,736,454 3,010,738 -2,725,716 285,022