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.
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I believe it is... 0.775 that my best estimate! Hope this helps!
6.9877
The estimate for the product of 289 and 7 is 2,000.
When you estimate 1 it gives you 0 , and if you estimate 7 it will give you 10.
I notice that 2219 is 'not far' from 2100 which is some even multiple of 7. Put another way 22 is 'not far' from 21. 2100 / 7 = 300