6.9877
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8 x 90 = 720
59
If you know the number is 7128 I do not understand why on earth anyone would want to estimate it!
2.65
Let's see. Estimating would start with rounding up 498. 498 will turn into 500. Next, we round 12. Twelve rounds to 10, so it ends up to become 500 divided by 10. 500 divided by 10 is 50. So, estimated, 498 divided by 12 would be somewhere near 50. (by the way, 498 divided by 12 is actually, non-estimated, 41.5.)