Mastering 43-Digit Subtraction: Estimating Differences

A library has 1,234,567,890,123,456,789,012,345,678,901 books. If they donate 987,654,321,098,765,432,109,876,543,210 books, how many books do they have left?

• 987654321098765432109876543210

• 246913579024691357902469135691

• 123456789012345678901234567890

• 246913569024691356902469135691

A factory produced 2,345,678,901,234,567,890,123,456,789,012 toys. If 1,234,567,890,123,456,789,012 toys were sold, how many toys remain?

• 2,345,678,901,234,567,890,123,456,789,000

• 2,345,678,900,000,000,000,000,000,500

• 2,345,678,900,000,000,000,000,000,001

• 2,345,678,900,000,000,000,000,000,000

A city had a population of 5,678,901,234,567,890,123,456 people. After a census, it was found that 2,345,678,901,234,567,890,123 people moved away. What is the new population?

• 5,678,901,234,567,890,123,456

• 2,345,678,901,234,567,890,000

• 3,000,000,000,000,000,000,000

• 3,333,222,333,333,322,233,333

A bank had a total of 9,876,543,210,123,456,789,012 dollars. If they loaned out 4,321,098,765,432,109,876,543 dollars, how much money is left in the bank?

• 5,555,444,444,691,346,912,469

• 6,000,000,000,000,000,000,000

• 4,555,444,444,691,346,912,469

• 5,000,000,000,000,000,000,000

A school had 3,456,789,012,345,678,901,234 pencils. If they used 1,234,567,890,123,456,789,012 pencils for art projects, how many pencils are left?

• 222221122222222112223

• 222221122222222112220

• 222221122222222112221

• 222221122222222112222

A company had 7,890,123,456,789,012,345,678 products in stock. If they sold 3,456,789,012,345,678,901,234 products, how many products do they have now?

• 3,456,789,012,345,678,901,234

• 4,000,000,000,000,000,000,000

• 5,000,000,000,000,000,000,000

• 4,433,334,444,443,333,444,444

A farmer harvested 6,543,210,987,654,321,098,765 apples. If he sold 2,345,678,901,234,567,890,123 apples, how many apples does he have left?

• 419753208639

• 419753208640

• 419753208641

• 419753208642

A bookstore had 8,765,432,109,876,543,210,123 books. If they received a shipment of 1,234,567,890,123,456,789,012 books, how many books do they have in total?

• 8,766,666,999,966,000,000,135

• 8,766,000,000,000,000,000,000

• 8,765,432,109,876,543,210,000

• 8,765,432,109,876,543,210,123,456

A tech company had 4,321,098,765,432,109,876,543 devices. If they recycled 1,234,567,890,123,456,789,012 devices, how many devices are still in circulation?

• 4,319,864,197,542,653,387,531

• 4,320,000,000,000,000,000,000

• 4,321,098,765,432,109,876,543

• 1,234,567,890,123,456,789,012

A zoo had 2,345,678,901,234,567,890,123 visitors last year. If 1,234,567,890,123,456,789,012 visitors came this year, how many visitors did they have in total?

• 3,580,246,791,358,024,679,135

• 4,000,000,000,000,000,000,000

• 1,234,567,890,123,456,789,000

• 2,345,678,901,234,567,890,000