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Science · Stage 6

Repeat and Average

One reading can be off, so good scientists measure the same thing several times, add the readings and share them out to find the average — and a reading that does not fit the rest is an anomaly worth a second look.

✦ Science📘 Stage 6 · S6⏱ ~12 min🧒 Ages 10–12★ Free to start
I can take repeated measurements, find their average, spot an anomaly, and explain why repeating makes a result more reliable.
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Kavi the owl for Science
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Kavi Measures Twice, Then Again

Kavi crouches over a bean plant with a ruler 📏. "Watch this! I measured my plant and got 20 cm… then 21… then 20 again. A tiny bit different every time! One reading can always be a little off, so a careful scientist measures several times and finds the average — add the readings up, then share them out fairly. And look — this try says 2 cm?! That doesn't fit the others at all; it's an anomaly, so I'll measure it again. Repeating is exactly what makes a result you can trust. Come and be a careful scientist with me!"

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What your child will learn

1Repeat, average, anomaly, reliableCareful measuring has four moves. Tap each card to learn what it means!
2One seedling, measured five times
3Think it through, then tapEach test uses one of the four moves. Read it, pick the best answer, then tap Next test.
4Sort careful science from carelessA reliable result comes from careful measuring. Decide whether each habit makes a result more reliable or less reliable.
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A peek inside

Kavi measures a pencil three times and gets 15 cm, 14 cm and 16 cm. What is the average length?
I add the readings: 15 + 14 + 16 = 45. There are 3 readings, so I divide the total by 3: 45 ÷ 3 = 15. The average is the fair, shared-out value.

Try this at home: Why do good scientists measure the same thing several times?

Ready to play and learn?

Start the free interactive lesson, or print the handout for screen-free play.

Start the free lesson →⬇ Download PDF

Part of Science · Stage 6 · S6 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.