By rounding off.
I'd choose 20 and 30 and estimate the product at 600. The actual answer is 625.
In your example, the easiest way to estimate the product would be to round each factor to the nearest 10, 100, 1,000 or whatever the factors are. So, for 6,893 * 556, round to 7,000 * 600 to get an estimate. Since both numbers are rounded up, you know your estimate will be high, but this is an easy way to get a close answer. To be specific here, 7,000 and 600 would be multiplied to get 4,200,000. You multiply the first digits together, and then add the total number of zeroes in each rounded number to your answer.
Because that product would have both of the two numbers as factors, giving it at least a total of 4.
The largest possible product of two numbers that add to give a greater number is half of that greater numbered, squared (where the two numbers are each half of the greater number). For the square root of 3, this would be ½ x √3 x ½ x √3 = ½ x ½ x 3 = ¼ x 3 = 0.75.
It depends on what the numbers are. For example, if the prime numbers you were talking about were 3 and 7, the least common multiple would be 21. If your numbers were 2 and 3, it would be 6.
It would have to be an even number greater than one as well.
A number greater than 50 with only 2 prime factors would be a semiprime number. Semiprime numbers are products of exactly two prime numbers. An example of a semiprime number greater than 50 would be 77, which is the product of the prime numbers 7 and 11.
The answer is 2,800. To estimate the product of 2 numbers, you round to the nearest ten or hundred. In this case, you would round 73 to 70, and 403 to 400, to make it easy to multiply. 70 x 400 = 2,800
Sometimes, sometimes not see 20,000 X 0 = 0 would be less. 20,000 X 1 =20,000 would be the same and 20,000 X 2 = 40,000 would be greater.
Compatible numbers would be easier. Rounding gives you 14 x 47. Compatible numbers could be 13 x 50 which would be closer to the actual product.
199 over 198 estimate = 1 actual answer would be greater than 1 35 over 17 estimate = 1 actual answer would be greater than 1
If the sum of 2 numbers is 25 and their product is 156, the 2 numbers would be 12 and 13.