7x87 is about 7x90, which equals 630
609.
The estimate for the product of 289 and 7 is 2,000.
The best estimate is the true value.
5,200
25x80 < 28x87 < 30x90 --> 2000 < 28x87 < 2700?
There is no definitive answer for an estimation, so you could come up with something around 35000. The actual product is 35061, so that would be close.
87+7= 94
87 x 64 = 5568
It is 91 times 87 = 7,917
87 multiplied by 98 is 8,526.
35 multiplied by 87 is 3,045.
87 multiplied by 624 is 54,288.