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Grades 3–4ScienceEngineering DesignLesson 1 of 1Ages 8–10

How does a nón lá keep a rice farmer dry?

Science and English together, for English learners at CEFR A2–B1. Teams build paper cone hats of three shapes, test them under 'monsoon rain' and 'midday sun', and measure how far each one sends the water and how much shade it makes. Then they design the best hat for a rice farmer.

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First page of the How does a nón lá keep a rice farmer dry? teacher guide
Three model hats, from flat to steep, tested in the rain: on the steep cone the water runs off fastest.Preview · the opening mission

This lesson teaches science and English together (CLIL: content and language integrated learning). It is written for students learning English at about CEFR A2–B1.

Students will…
Science Test how the shape of a hat changes where rain goes and how much shade it gives, using a fair test, and choose the best design with evidence.
Language: words Use the key words: rain, sun, shade, wet, dry, cone, steep, flat, wide, measure, compare.
Language: speaking Predict with a reason: I think the ___ hat will keep the head driest because ___. Compare: The steep hat is drier than the flat hat.
Language: writing Write a short recommendation using should and because, with a measurement.

Before the lesson: teach the key words with the real objects: spray water (rain), shine the lamp (sun), point to the shadow (shade). Show a real nón lá or a photo. The Key words worksheet has English and Vietnamese, with a space to draw each word.

Look inside the PDF

Sample pages, stamped “preview”. The download is the clean, full lesson.

Teacher guide, page 1
Inside: the lesson steps
Student sheet, ready to copy

In the full lesson PDF

  • Mission (5 min)
  • Predict (5 min)
  • Hunt (25 min)
  • Reveal (10–15 min)
  • Act (10 min)
  • Background for the teacher
  • Assessment
  • Student sheet
  • Worksheet: Key words
  • Worksheet: Talk about it
  • Worksheet: Label the hats
  • Worksheet: Try it at home

On the student sheet

  • My prediction
  • Our results
  • What we kept the same, and what we changed
  • My recommendation to Minh's aunt
  • Exit ticket
  • Key words
  • Talk about it
  • Label the hats
  • Try it at home

US Letter, prints cleanly in black and white. The student sheet is on its own page, ready to photocopy.

Free with an account (any 3 lessons), or US$19 / C$25 for all 1 lessons in this unit.

What students show by the end

  • Runs a fair test
  • Explains with shape
  • Uses evidence to design

From the lesson’s rubric, which scores each one as not yet, getting there or got it.

Questions teachers ask

How long does “How does a nón lá keep a rice farmer dry?” take?

60 min, or two 35-minute periods. Group size: teams of 3.

How much prep does it need?

20 minutes: from ordinary printer paper, cut circles 16 cm, 21 cm and 28 cm across (about 6, 8 and 11 in), one of each per team, plus a spare 16 cm circle per team. On each team's newspaper, draw a 14 cm (5½ in) circle as the base template. Fill one spray bottle or small watering can per team. Set up a desk lamp, or plan to use a sunny window.

What materials do I need?

Ordinary paper circles, 16 cm, 21 cm and 28 cm across (one of each makes three hats with the same width), plus one spare 16 cm circle; stopwatch, or a clock with a seconds hand; tape and scissors; plastic cup (the farmer's 'head'); square of paper towel, 5 cm, to sit on top of the cup; spray bottle or small watering can; and 3 more. Cost: about $10 for a class of 30.

Which curriculum standards does it cover?

NGSS (US): 3-5-ETS1-1, 3-5-ETS1-3, 3-ESS2-2 and K-2-ETS1-2.

What’s in the lesson PDF?

A teacher guide that walks you through mission, predict, hunt, reveal, act, background for the teacher and assessment, then a student sheet (“My prediction”; “Our results”; “What we kept the same, and what we changed”; “My recommendation to Minh's aunt”; “Exit ticket”; “Key words”; “Talk about it”; “Label the hats” and “Try it at home”) on its own page, ready to photocopy. It’s US Letter and prints cleanly in black and white.

Can I try it for free?

Yes. A free account includes any 3 full lessons of your choice, and this can be one of them. After that, this unit is US$19 (C$25) for all 1 lessons, yours to keep, or every lesson is US$79 (C$109) a year.