Comparing, Ordering and Summing Data (IOD 402)

A lot of science passages hand you a table and then ask something deceptively plain: which value is highest, which is third, what do four of them add up to. There is no formula to find, no relationship to interpret. The table already holds the answer. The only job is to read the right column carefully and either order the numbers or combine them. Treating this like a bigger analysis question wastes time and invites errors.

Tables are rarely sorted the way a question needs. A table might list wells by number, plots by letter, or months in order, with no regard to which concentration or count is biggest. So when a question asks for a rank, write the values out and reorder them yourself, highest to lowest or lowest to highest, matching each number back to its row label as you go. For a sum, just add straight down the column, keeping units consistent. These are arithmetic steps, not reasoning steps, and the danger is only carelessness: skipping a row, misreading a decimal, or mislabeling which plot got which value.

The twist comes when two rows tie on the column being ranked. A passage will sometimes supply a second column just for this situation and tell you outright which direction breaks the tie. When that happens, the tie column stops mattering and the tiebreaker column decides first place. This skill sits right next to trend-spotting and interpolation: once you can rank and sum cleanly, you are ready to notice patterns across rows rather than just within one column.