Estimate
sums
sums
57 + 34; tens
90
78 - 32; tens
50
Three boxes filled with fiction book and two boxes filled with reference books were just delivered. If there are 120 books in each box, how many are there in total?
360 books
398 + 312
710
478 - 299
179
129 + 834; hundreds
900
724 - 398; hundred
300
There are 975 books in the library. 536 are being loaned out currently. How many books are left?
439 books
6, 012 + 4, 827
6, 146 - 4, 864
1, 282
7, 297 + 4, 923; thousand
12,000
5, 124 - 4985; thousands
0
There were 4450 non-fiction books but 830 went missing and 45 were taken to another library. How many non- fiction books are left?
3575 books
32, 007 + 19, 655
51, 662
10, 050 - 7, 310
2, 740
782, 492 + 305, 234; hundred thousands
1, 100, 000
607, 345 - 235, 845; hundred thousand
400,000
Mount Baker is 10, 781 ft tall and Mount St. Helens is 8, 363 ft tall. If you were to stack the mountains, how tall would it be in all?
19, 144 ft
744, 923 + 281, 502
1, 026, 425
333, 333 - 292, 765
40, 568
679, 535 + 457, 123; ten thousands
1, 140, 000
888, 753 - 537, 205; ten thousand
340,000
Mount Rainier is 14, 411 ft tall. Glacier Peak is 10, 541 ft tall. How much taller is Mount Rainier than Glacier Peak?
3,870 ft
1, 234, 567 + 1, 765, 432
2, 999, 999
902, 804 - 469, 325
433, 479