Show:
100-200
Addition
Subtraction
What number is missing
100

What number is right in the middle of 100-200

150

100

1+3

4

100

3-2

1

100

 +4=7

3

200

What number is in the middle 100-160

130

200

4+2

6

200

10-6

4

200

 -2=0

2

300

What is 120+130

150

300

12+3

15

300

12-7

5

300

 +7=20

13

400

what is 134+234

 386

400

20+33

53

400

20-14

6

400

 -9=7

2

500

What is 100 rounded to the nearest 10

110

500

100+48

148

500

23-13

10

500

 -14=7

7