Adding and Subtracting

Choose the correct answer to the addition and subtraction problems below.

published on April 14, 2011
1/10

30+20=?

30
40
50
60
2/10

40+40=?

100
110
80
90
3/10

25+25=?

25
50
75
100
4/10

40-10=?

10
50
30
20
5/10

100-20=?

100
70
90
80
6/10

60-30=?

10
20
30
40
7/10

10+11=?

21
30
27
38
8/10

500+500+1=?

1000
1001
1002
1011
9/10

200-1=?

198
299
300
199
10/10

Bonus Question:
87+100+13+1=?

200
210
201
301