Vocabulary
This is the answer to an addition problem
Sum
Round each addend to the nearest hundred, then find the sum.
8,675 + 3,214
8,700 + 3,200 = 11,900
17,690 + 53,024
45,982
9,256 - 7,183
2,073
There are about 12,762 known ant species. There are about 10,997 known grasshopper species. The total number of known ant, grasshopper, and spider species is 67,437. How many known spider species are there?
There are 43,678 known spider species.
This is the answer to a subtraction problem
difference
Round each number to the nearest thousand, then find the difference:
87,615 - 54,306
88,000 - 54,000 = 34,000
61,096 + 8,765
69,861
96,090 - 5,130
90,960
Alaska has 22,041 more miles of shoreline than Florida and California combined. Alaska has 33,904 miles of shoreline. Florida has 8,436 miles of shoreline. How many miles of shoreline does California have?
California has 3,427 miles of shoreline.
An _______ is a number that is close to the exact number.
estimate
Estimate the sum of 27,269 and 14,608 by rounding to the nearest thousand.
27,000 + 15,000 = 42,000
Mr. Beast received 10,678 views on his video in the first minute. He then received an additional 22,401 in his second minute, and 82,906 in his third minute. How many views did Mr. Beast receive in the first three minutes?
Mr. Beast got 115,985 views in the first three minutes.
90,219 people attended the Super Bowl last year. 71,088 people attended this year. How many more people attended last year than this year?
19,131 more people attended
Earth is 24,873 miles around. If a person's blood vessels were laid out in a line, they would be able to circle earth two times, plus 10,254 more miles. How many miles long are a person's blood vessels when they are laid out in a line?
When laid out in a line, a person's blood vessels are 60,000 miles long.
The ________ property of addition tells us that changing the order of addends does not change the sum.
commutative
Estimate the difference between 46,895 and 87,532 by rounding to the nearest ten thousand.
90,000 - 50,000 = 40,000
One World Trade Center has 2,226 steps. A visitor enters the building and climbs 1,387 steps, takes a break, and climbs 839 more steps. Did the visitor reach the top? How do you know?
yes, because 1,387 + 838 = 2,226
The shoreline of Lake Michigan is 1,090 miles shorter than the shoreline of Lake Superior, which is 2,730 miles. How long is the shoreline of Lake Michigan?
The shoreline of Lake Michigan is 1,640 miles long.
World War I lasted from 1914 to 1918. World War II lasted from 1939 to 1945. How much longer did World War II last than World War I?
WWII lasted 2 years longer than WWI.
The ________ is the number you are subtracting from the minuend in a subtraction problem.
A storm causes 23,890 homes to be without power on the east side of the city and 18,370 homes to be without power on the west side. About how many homes altogether are without power?
20,000 + 20,000 = 40,000
or
24,000 + 18,000 = 42,000
There were 19,787 more people who rode the city buses on Saturday than on Sunday. On Sunday, 74,057 people rode the buses. How many people rode the buses on Saturday?
93,844 people
The first telephone was invented in 1876, the first cellphone was invented in 1973, and the smartphone was invented in 2002. How many years after the first cellphone was invented was the smartphone invented?
The smartphone was invented 29 years after the first cell phone.
Twenty people each donate $9 to a charity. Sixty people each donate $8. The charity organizer wants to raise a total of $1,500. How much more money does the organizer need to raise?
The organizer needs to raise $840 more.