Final answer:
In an addition table, moving up three rows and left one column decreases each value by 4, as you're subtracting 3 from the row's starting value and 1 from the column's starting value.
Step-by-step explanation:
The question relates to how the value in an addition table changes when moving up three rows and to the left one column. To understand this, we need to think about what an addition table represents. Each entry in an addition table is the sum of the value from the top row and the value from the left column of that entry. So, when you move up three rows, you are essentially subtracting 3 from the row value. Similarly, moving left one column means you subtract 1 from the column value.
For example, if we start with the value 8 in the addition table, and it is the result of adding 5 (from the left column) and 3 (from the top row), moving up three rows and left one column would mean we are now looking at the sum of 2 (5 - 3) and 2 (3 - 1), which gives us a new sum of 4. Thus, each value in the addition table would decrease by 4 when we make this move.