Addition
1+3
4
What number is right in the middle of 100-200
150
+4=7
3
15-7
8
4+2
6
What number is in the middle 100-160
130
-2=0
2
200-100
12+3
15
What is 120+130
250
+7=20
13
1000-300
700
20+33
53
what is 134+234
368
9- =7
2
500-250
100+48
148
What is 100 rounded to the nearest 10
110
14- =7
7
1200-300
900