easy
medium
difficult
tricky
forluck
100
22-33
-11
100
666-1
665
100
566-933
-367
100
354-257
97
100
A library had 567 books. It gave away 375 books.
How many books are left?
192
200
36-9
27
200
700-631
69
200
432-253
179
200
854-651
203
200
A store had 824 candies. It sold 356 candies during the day.
How many candies are left in the store?
468
300
85-35
50 
300
555-288
267
300
962-785
177
300
322-152
170
300
A school bought 950 pencils. The students used 428 pencils.
How many pencils are left?
522
400
66-49
17
400
999-932
67 
400
365-285
80
400
554-455
99
400
A zoo had 732 visitors in the morning. By the afternoon, 458 visitors had left.
How many visitors are still in the zoo?
274
500
98-24
74
500
655-336
3119
500
552-358
194
500
358-256
102
500
A warehouse had 680 boxes. It shipped 245 boxes to another city.
How many boxes are left in the warehouse?
435.