Estimation: 760 × 10
The 760 came from the 8. The 8 had round up the 5 to a 6. The 10 came from were because the 6 was higher than 5, it rounds up to 10.
Product: If you mean the estimating number, then 760 × 10 = 7,600 or if you mean the original number, then 758 × 6 = 4,548.