Well, well, well! A new recruit! 👋

I'm Detective Dash, and I solve mysteries using DATA! 📊

You see, the world is FULL of information — numbers, graphs, charts, and patterns. A good detective knows how to collect, organise, and read data!

Today we'll crack SIX big cases:

📊 Case 1: Reading Graphs & Tables

📈 Case 2: Collecting & Organising Data

🎲 Case 3: Chance & Probability

⚖️ Case 4: Mass & Volume

🧭 Case 5: Position & Direction

🌡️ Case 6: Temperature

Ready to join the Data Squad? Let's investigate! 🕵️

Graphs are pictures that show us data! They help us compare things quickly! 📊

Picture Graph (Pictograph) uses little pictures to show amounts:

🍎🍎🍎 = 3 apples

🍌🍌🍌🍌🍌 = 5 bananas

Sometimes one picture = 2 or more! If 🍎 = 2 apples, then 🍎🍎🍎 = 6 apples!

Bar Graph uses bars (rectangles) to show amounts. Taller bar = bigger number!

Reading a bar graph:

1️⃣ Read the title — what is the graph about?

2️⃣ Read the labels — what do the axes show?

3️⃣ Read the scale — what does each line mean?

4️⃣ Compare the bars — which is tallest/shortest?

A table organises data in rows and columns. It's like a neat grid! 📋

Tables have headings at the top of each column to tell you what the data means.

A line graph connects dots with a line to show how something CHANGES over time! 📈

Line graphs are great for showing:

🔹 Temperature over a week

🔹 How tall a plant grows each day

🔹 How many books you read each month

If the line goes UP ↗️ = the amount is increasing

If the line goes DOWN ↘️ = the amount is decreasing

If the line stays FLAT → = the amount stayed the same

Good detectives need to collect evidence! In maths, we collect DATA through surveys and experiments! 📋

Tally Marks help us count quickly:

| = 1, || = 2, ||| = 3, |||| = 4

𝍸 (four lines with a diagonal) = 5!

This makes counting by 5s really easy! 🖐️

Steps to collect data:

1️⃣ Ask a question (What's your favourite colour?)

2️⃣ Survey people and record answers

3️⃣ Use tally marks to count

4️⃣ Put the data in a table

5️⃣ Create a graph to show it

Chance is about how LIKELY something is to happen! 🎲

We use special words to describe chance:

⬛ Impossible — it will NEVER happen (rolling a 7 on a normal dice)

🟥 Unlikely — it probably WON'T happen (snow in summer in Sydney)

🟨 Even chance — it MIGHT or MIGHT NOT happen (flipping heads on a coin)

🟩 Likely — it will PROBABLY happen (the sun rising tomorrow)

🟦 Certain — it will DEFINITELY happen (Monday comes after Sunday)

Think of it like a scale from impossible to certain!

A fair game gives everyone an equal chance. If one person has a better chance, it's unfair! 🎯

Let's investigate probability with real experiments! 🔬

Coin flip: 🪙 Heads or tails? There are 2 options, so each has an even chance (1 out of 2).

Dice roll: 🎲 There are 6 faces, so the chance of rolling any number is 1 out of 6.

What's the chance of rolling an EVEN number (2, 4, or 6)? That's 3 out of 6 = even chance!

Spinners: If a spinner has 4 equal sections (red, blue, green, yellow), the chance of landing on each colour is 1 out of 4.

But if 3 sections are red and 1 is blue? Red is more likely (3 out of 4)! 🎯

The more sections of one colour, the more likely it is to land there!

Mass is how heavy something is! We measure it in grams (g) and kilograms (kg). ⚖️

Grams (g) = for LIGHT things:

🔹 A paperclip ≈ 1 g

🔹 An apple ≈ 150 g

🔹 A slice of bread ≈ 30 g

Kilograms (kg) = for HEAVY things:

🔹 A bag of sugar = 1 kg

🔹 A cat ≈ 4 kg

🔹 A child ≈ 25–35 kg

The magic number: 1 kg = 1000 g (just like 1 kilometre = 1000 metres!)

To convert: 2 kg = 2 × 1000 = 2000 g

And: 3500 g = 3500 ÷ 1000 = 3.5 kg

Capacity is how much liquid a container can hold! We measure it in millilitres (mL) and litres (L). 🥤

Millilitres (mL) = for SMALL amounts:

🔹 A teaspoon ≈ 5 mL

🔹 A juice box ≈ 250 mL

🔹 A can of soft drink = 375 mL

Litres (L) = for BIG amounts:

🔹 A bottle of milk = 1 L

🔹 A bucket ≈ 10 L

🔹 A bath ≈ 150 L

The magic number: 1 L = 1000 mL

To convert: 2 L = 2000 mL

And: 1500 mL = 1.5 L

A detective always knows WHERE things are! Let's learn about position and direction! 🧭

Position words:

🔹 Left, right, above, below

🔹 Between, next to, behind, in front of

🔹 Inside, outside, beside, opposite

Compass Directions:

⬆️ North (N) — up on a map

⬇️ South (S) — down on a map

➡️ East (E) — right on a map

⬅️ West (W) — left on a map

Memory trick: "Never Eat Soggy Weetbix!" — N, E, S, W going clockwise! 🥣

Grid references tell us the exact position on a grid — like coordinates on a treasure map! 🗺️

We write them as (column, row) — always go ACROSS first, then UP!

Example: (3, 2) means go 3 across and 2 up!

Memory trick: "Along the corridor, then up the stairs!" 🏠

Now let's learn about Turns:

🔹 Quarter turn = 90° (like a corner)

🔹 Half turn = 180° (facing the opposite way)

🔹 Three-quarter turn = 270°

🔹 Full turn = 360° (back to where you started!)

Turns can go clockwise ↻ (same as clock hands) or anticlockwise ↺ (opposite)!