Final answer:
The products of 5x7 and 3x7 can be used to solve 7x8 using the distributive property.
Step-by-step explanation:
The products of 5x7 and 3x7 can help Mr. Blackert solve 7x8 by using the distributive property. The distributive property states that multiplying a number by the sum of two other numbers is the same as multiplying the number by each of the two other numbers, and then adding the products together.
In this case, 7x8 can be broken down as (5x7 + 3x7). This is because 7x8 can be expressed as the sum of 5x7 and 3x7. By knowing the products of 5x7 and 3x7, Mr. Blackert can find the product of 7x8.
Using the distributive property, we can calculate 7x8 as follows: 7x8 = (5x7) + (3x7) = 35 + 21 = 56.