A	B
2	5
3	7
4	9
5	11
...	...
7	?

If the pattern shown in the table on the left were continued, what number would appear in the box at the bottom of column B, where A is 7? 19 13 18 12 15 1 Sorry, that's not right. In problems like this, you need to find the common difference and add it to the last given number the right number of times. The common difference here is 2, and the correct answer is 15. Could be that the student added wrong. 2 Good try, but not quite. It looks like you added the correct common difference (2) to the last given item only one time. The problem asked for the value of B when A is 7. The correct answer is 15. Could have added 2 to the "last number" ignoring the hiatus. 3 Sorry, that's not right. In problems like this, you need to find the common difference and add it to the last given number the right number of times. The common difference here is 2, and the correct answer is 15. Seems to have added 11 to 7. 4 Sorry, that's not right. In problems like this, you need to find the common difference and add it to the last given number the right number of times. The common difference here is 2, and the correct answer is 15. It's possible that the student just added 1 to 11. 5 Right! The student got this item correct. TableArithmetic ExtendArithmetic