adding
Mental Math 50+50
100
1-1
0
2x2
4
16 divide 4
4
1/2+1/2
2/2 or 1
400+300
700
500-300
200
8x8
64
64 divide 8
8
2/4+1/4
3/4
1000+8000
9000
300-299
301
9x9
81
12 divide 3
4
8/16+2/16
10/16
567+5
572
700-200
500
11x11
121
100 divide 10
10
40/100+50/100
90/100
10000000+1000000000
20000000000
1000-999
1
12x12
144
144 divide 12
12
1/10+8/10
9/10