The closest estimate for the product of 2 x 19 x 5 equals 200.
6+2=8
The product of the square of 1/2 and the sum of 13 and 19 is 169/4.
19 and 2
As a product of its prime factors: 2*2*19 = 76
76 = 2 x 2 x 19 OR 22 x 19
6+2=8
Round 38 to 40. Estimate the product as 80. The actual product is 76.
The product of the square of 1/2 and the sum of 13 and 19 is 169/4.
19 and 2
As a product of its prime factors: 2*2*19 = 76
76 = 2 * 2 * 19
76 = 2 * 2 * 19
It is: 2*2*19 = 76
As a product of its prime factors:3*7*19*19 = 7581
76 = 2 x 2 x 19 or 22 x 19
76 = 2 x 2 x 19 OR 22 x 19
The closest estimate is the exact answer. For any other estimate, you can do better with more effort.150*83 = approx 100*3/2*82 = 100*3*41 = 100*3*40 = 12000.