The estimate for the product of 289 and 7 is 2,000.
5,200
25x80 < 28x87 < 30x90 --> 2000 < 28x87 < 2700?
87 multiplied by 624 is 54,288.
35 multiplied by 87 is 3,045.
7x87 is about 7x90, which equals 630
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?
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.
87+7= 94
300 x 7 = 2100
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.