To read a value off a Science graph, hold scratch paper or a card as a straightedge along the axis. On paper, a pencil works the same way. This is not the bubble-sheet-as-ruler trick, which is paper-only, in using the answer sheet as a ruler.
Track the line
Interpolation and extrapolation both get easier when the edge is straight. Line up with the tick you care about, then slide to the curve. Trends and in-between points are in interpolating and extrapolating.
Digital zoom is another way to see the same tick, in zooming Science graphs. Scratch paper on the digital test is in scratch paper on the digital ACT.
The bottom line
A straight edge beats a hovering finger. Use paper, a card, or a pencil.
Start practicing
Start with a free diagnostic, then drill your weak spots with 15-question quizzes and track how you're doing across Reading, English, and Math. Compare plans whenever you're ready to go further.
This article offers general ACT prep guidance. The ACT can change from year to year, including its format, scoring, policies, test dates, and fees, so always confirm the latest details on the official ACT website at act.org before you make decisions. ACT® is a registered trademark of ACT, Inc. thirty-six is not affiliated with, endorsed by, or sponsored by ACT.