Subtraction
800 - 500
300
5802 + 3
5805
6 * 1
6
A pack of 60 pencil crayons is purchased. After one week, 10 are lost. The next week, 3 are found. How many are there in the pack at the end of the second week?
53
70 - 5
65
600 + 70 + 70
740
0 * 7
0
There are 100 questions on a quiz. 10 are taken off because they were too easy, but after a teacher revised the quiz, she put back the 10 and added 20 more. How many questions are now on the quiz?
130
1
73 + 8
81
7 * 5
35
In a community, 2 residents live in one house. There are 20 houses with residents. If 4 residents leave, how many houses have residents?
18
566 - 455
111
1000 + 0 + 0 + 1 + 0 + 1
1002
102
100
1000 + 1 - 1
1000