Mental Math
95-5
90
3+5
8
2-1
1
2 × 9
18
5÷5
1
80-10-20
50
7+6
13
13-6
7
9 × 3
27
90÷10
9
30 × 27
810
26+8
34
39-15
24
12 × 7
84
91÷7
13
200-10-10-10-170
0
15+21
36
56-17
39
15 × 18
270
735÷7
105
10000÷20
500
221+25
246
392-141
251
20 × 35
700
399÷19
21