Rounding
What is 386 rounded to the nearest hundred?
400
Round to the nearest hundred, then solve: 465 + 478
1000
Mrs. Chavez has 22 students in her class. What is 22 rounded to the nearest 10?
20
What is an addend?
A number that is added together
33 + 71 + 56 + 29 =
189
What is 14 rounded to the nearest ten?
10
Round to the nearest hundred, then solve: 186 + 460
700
Mrs. Sullivan had 684 books in the library. She bought another 129 books over the summer. What is the best estimate for how many books are in the library now?
about 800 books
What is a sum?
134 + 249 =
383
What is 333 rounded to the nearest ten?
330
Round to the nearest hundred, then solve:
523 + 195
700
On Saturday, Ms. Resheske went hiking and took 28 pictures for her scrapbook. The next day, she took 42 pictures for her scrapbook. How many pictures did she take in all on Saturday and Sunday?
70 pictures
Show the commutative property of addition.
Example,
5+2 = 7
2+5 = 7
18 + 39 + 32 =
89
What is 589 rounded to the nearest hundred?
600
Round to the nearest hundred, then solve:
632 + 244
800
Fred Meyer sold 213 apples in June and 455 apples in July. How many apples did Fred Meyer sell in June and July altogether?
668 apples
What is an estimate?
A best guess answer. (A number close to an exact amount.)
918 - 427 =
491
What is 756 rounded to the nearest ten?
760
Round to the nearest ten, then solve:
27 + 78
110
During the first week of school, 345 students bought a hot lunch. During the second week of school, 23 fewer bought a hot lunch than the week before. How many hot lunches did Ms. DJ have to make during those two weeks?
667 hot lunches
Show the Identity Property of Addition
Example
1,000,000 + 0 = 1,000,000
152 - 99 =
53