300 x 7 = 2100
109?
300 and 10
You can add 289 and 7 together without estimating. you can add 2, 8, 9 and 7 together without estimating. If you have to, 290 and 7 = 297.
0.0242
289 x 7 = 2023.
The product of 289 and 7 is 2023.
About 4 millimeters
Estimate: 12 -5 = 7 Actual: 12.35 -4.785 = 7.565
7 milliliters
The best estimate is, obviously, the exact answer which is 671898.4556 : anything else is less than best.A respectable estimate is 4000*175 = 4000*(7/4)*100 = 1000*(7)*100 = 700000.
1, 7, 17, 119, 289, 2023.