Powers of 10
45 x 100
4,500
4.23 + 3.12
7.35
630 / 9
70
4/8 + 3/16
9/16
351 x 10
3,510
15.23
480 / 6
1/2 + 1/2
1
7.82 x 103
7,820
6.87 - 1.34
5.53
21,000 / 30
700
5/6 + 7/12
17/12 OR 1 5/12
78.2 x 101
782
56.89 + 2.03
58.92
24,000 / 600
40
3/4 - 5/12
4/12 or 1/3
62.3 x 104
623,000
6.23 x 4.2
26.166
720 / 16
45
ESTIMATE:
2 1/4 + 4 7/8
2 + 5 = 7