Counting and comparing groups
Be able to count how many there are in each group and compare them.
Prerequisites
- AFrom observations to a tablerequired
Everyday explanation
You have sorted things into groups. Now you are going to count them and see which group is biggest.
Apples: 🍎🍎🍎🍎🍎 5
Bananas: 🍌🍌🍌 3
Pears: 🍐🍐🍐🍐🍐🍐🍐 7
Three words you need:
| Word | Means |
|---|---|
| more | there is a greater number of it |
| fewer | there is a smaller number of it |
| the same | exactly the same number |
Pears are the most. Bananas are the fewest.
How many more? Pears 7, bananas 3. Work it out: 7 − 3 = 4 more pears.
A tip for counting correctly: point at each thing as you count it, and move it aside once you have. Then you never count anything twice.
Interactive
Count things at home or in the classroom. Pick something you have a lot of.
Task 1 — shoes in the hallway. Sort them by colour. Count each pile. Write:
black: ___
white: ___
other: ___
Which colour is there most of? How many more is that than the smallest pile?
Task 2 — letters in your names. Everyone in the group writes their name. Count how many letters each name has. Who has the most? Who has the fewest? Do any have the same?
Task 3 — compare two days. Count how many people bring a packed lunch on Monday and on Tuesday. Were there more, fewer or the same?
A question to think about: if you count a pile twice and get different answers — what did you do wrong the first time? (Usually: skipped something, or counted the same thing twice.)
Mastery means
- Counts how many there are in each group
- Compares groups using more, fewer and the same
- Works out how many more there are
Sign in to do the exercises and build your mastery up.
Sources
- Matteboken (Mattecentrum) — free to read, non-profit association
- CS Unplugged (CC BY-SA 4.0) — CC BY-SA 4.0
- Skolverket — About AI in school (in Swedish) — Skolverket's open terms