estimating and solving
39 + 192=
230
65+73=
138
50 x 40 x 20
2000 x 20=40,000
.987 x 10
9.87
87 x 4
320 + 28 = 348
452 + 598=
1050
87-35=
52
75 x 20 x 5
7,500
.876 divided by 10
.0876
561 x 3
1,500 + 180 + 3 = 1,683
951-523=
430
427- 218=
209
97 x 25 x 40
97,000
56.12 x 1000
56,120
45 x 200
40 x 200 + 5 x 200 = 8,000 + 1,000= 9,000
1039 - 248=
790
876+123=
999
80 x 50 x 10
4,000 x 10=40,000
99.321 x 10
993.21
54 x 9=
450 + 36= 486
401-399
0
654-399
250
16 x 50 x 40=
32,000
.034 divided by 100
.00034
543 x 6
3,000 + 240 + 18 = 3,258