Rounding
Addition
Subtraction
World Problems
100
Round 378 to the nearest ten.
380
100
15+15
30
100
89-12
77
100
There are about 525,600 minutes in a year, round this number to the nearest thousand.
526,000
200
Round 900,501 to the nearest hundred
900,500
200
53+78
131
200
34-17
17
200
There are 10,000 books in the school library, if the school orders 7,400 more, how many books will the library have?
17,400 books
300
Round 455,890 to the nearest thousand.
456,000
300
430+756
1,186
300
400-267
133
300
A year has 365 days, if we are in school for 180 days, how many days are we NOT in school?
185 days
400
Round 792,336 to the nearest ten thousand.
790,000
400
Add using the Subtotal Method: 321+123
300+100=400, 20+20=40, 1+3=4 =444
400
How many times do I need to "ungroup" in the problem 10,009-3,052
Three times: Ungroup the 1, the new 10, and the next new 10.
400
The Golden Gate Bridge is 8,980 ft long. The Bay Bridge is 23,556 ft. long. How much longer is the Bay Bridge?
14,576 ft.
500
Round 6,889,954 to the near hundred thousand.
6,900,000
500
Find the estimated and exact answer to: 1,456+ 3,785
Estimated: 1,000+4,000 = 5,000 Exact: 5,241
500
How many times do I have to ungroup with 7,620-5,233?
Twice: once with the two, and once with the six
500
If there are 60 minutes in an hour, and you get a good night's sleep of 8 hours, how many minutes of sleep did you have?
480 minutes
M
e
n
u