Milestones in medicine: put events in order: timeline worksheet for Grade 12, page 1 preview

Timeline worksheet · Science

Milestones in medicine: put events in order · Grade 12

Number 6 mixed-up events about milestones in medicine from oldest to newest. Practices chronological thinking and reading for detail.

Grade 12 · ages 17 to 18
Easy
10 to 15 minutes
1 page
Free

The answer key is a separate page for grown-ups. Sign in to download it.

Make another one like this

The events

Directions: These events are mixed up. Number them from 1 (the oldest) to 6 (the newest).

René Laennec invents the stethoscope.
Edward Jenner tests the first vaccine, using cowpox to protect against smallpox.
Joseph Lister publishes his method of antiseptic surgery.
The Human Genome Project is completed.
Wilhelm Röntgen discovers X-rays.
Jonas Salk's polio vaccine is declared safe and effective.
Think about it · Pick two events next to each other. How did the first one help lead to the second?

What your child practices

Your child practices chronological thinking and reading for detail.

Grades and ages: Grade 12, ages 17 to 18
Time: About 10 to 15 minutes
Subject: Science
Level: Easy for Grade 12
Answer key: Yes, for grown-ups who sign in
Printing: 1 page, US Letter or A4, low-ink option
Updated: October 15, 2026

How to use it

Try the first question together so the format is clear. Then let your child work through the rest, showing their thinking on the page. It is one of the easier sheets for Grade 12, good as a warm-up or a first look at the topic.

An answer key comes with it as a separate page that grown-ups download after signing in.

Tip for grown-ups: Find the oldest and newest events first, then fill in the middle.

Done on paper? A grown-up can record it on the child's page in PlayOwl; downloading alone doesn't count as finished.