What this worksheet practices
Measurement pages need to be exact. The ruler, object, and endpoints must match, or the worksheet teaches the wrong habit. This printable uses deterministic ruler drawings so each answer can be checked from the object length rather than guessed from a picture.
The field-guide setting helps students treat each bug like a specimen with two endpoints. Some bugs begin at zero and others begin later on the ruler, so students learn to measure the distance from start to end instead of copying the number under the tail.
Ask students to point to the left endpoint and right endpoint before answering. Then they can count the spaces between the numbers. The answer key gives the measured length and unit so checking remains quick.
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