Adding and Subtracting

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

published on April 14, 2011112 responses 7 4.5★ / 5

30+20=?

30
40
50
60

40+40=?

100
110
80
90

25+25=?

25
50
75
100

40-10=?

10
50
30
20

100-20=?

100
70
90
80

60-30=?

10
20
30
40

10+11=?

21
30
27
38

500+500+1=?

1000
1001
1002
1011

200-1=?

198
299
300
199

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

200
210
201
301