Add It Up
At a tire factory, 3,166 tires were made on Thursday and 2,941 tires were made on Friday. How many tires were made on Thursday and Friday in all?
What is 6,107 tires
anytime you add zero to a number the sum is always that number
Identity
Round to the nearest 100, then add.
6782 + 1340 =
6800 + 1300 = 8100
Sara scored 2,293 points in a video game. That was 1,536 more than Elvin's score on the same game. How many points did Elvin score?
What is 757 points
22+5=5+22
What is commutative
Round to the nearest thousand, then add.
3,289 + 25,818 =
3,000 + 26,000 = 29,000
There are 11,500 seats in the basketball arena. For one game, 9,465 seats were filled. How many seats were empty?
What is 2,035 seats were empty
34+ (23+5)= (5+34)+23
What is associative
Round to the nearest 10, then subtract.
2,746 - 1,529 =
2,750 - 1,530 = 1,220
77,000 - 33,068 =
43,932
Two years ago, Bob bought a used car that had 14,854 miles on the odometer. Last year, he drove 8,240 miles. This year, he drove 9,273 miles. How many miles does the odometer show now?
What is 32,367 miles
it doesn't matter the order they are in, the sum will always be the same when adding
What is commutative
Round to the nearest ten thousand, then add.
346,298 + 9,841,243 =
350,000 + 9,840,000 = 10,190,000
2,869 + 25,946 + 625 =
What is 29,440
62,500 - 19,249 =
43,251
George bought a car for $17,067. This price included a leather package for $1,248 and a heated seats for $269. What was the price of the car without these features?
What is $15,550
the order in which they are grouped does not change the sum
What is associative
Round to the nearest hundred, then subtract.
47,236 - 20,425 =
47,200 - 20,400 = 26,800