7x87 is about 7x90, which equals 630
609.
To estimate the product of 87 times 403, you can round both numbers to the nearest tens or hundreds. Rounding 87 to 90 and 403 to 400, you get 90 x 400 = 36,000. This is a rough estimate of the product of 87 times 403.
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?
87+7= 94
35 multiplied by 87 is 3,045.
87 x 64 = 5568
It is 91 times 87 = 7,917
87 multiplied by 98 is 8,526.
87 multiplied by 624 is 54,288.