Answer: part A is 0, 2, 4, 6, 8 and part B is Because the products all are even, the mystery factor must also be an even number. We have selected all of the even one-digit numbers.
Explanation:
So, the number you need to find is between 0 and 9, because is a 1-digit number. For example, it cannot be 10 because 10 is a 2-digit number.
So, the number could be like 0,1,2,3...etc
In the table, the "X" in the left upper corner is the symbol for multiplication.
The "?" in the left lower corner represents the mystery number.
The table shows that the product of the mystery number and 1,2,3,4 and 5 is always an even number
For example, the product of the mystery number and 3 is even.
That means that our mystery must be even.
So, we know that the mystery number is between 0 and 9 and it must be even.
Therefore, the mystery number can be one of the following numbers:
0, 2, 4, 6, 8