In every Swedish primary classroom it hangs. Ten rows, ten columns, each cell a number from 1 to 100. The 100-grid is one of the most underrated teaching tools and parents should have one at home too. This article shows why the 100-grid is so powerful, and ten activities you can do with it.
At Kluriko we have the 100-grid built into several of the Learning Games' maths exercises — but the physical 100-grid on the fridge or wall is magical in its own way.
What is the 100-grid?
A table:
- 10 rows, 10 columns
- Numbers from 1 to 100, top-left to bottom-right
- Row 1: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
- Row 2: 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
- ... and so on to 100
Buy at a bookshop or print one. Stick it on the fridge, wall or their desk.
Why is it so good?
Visualises the base-ten system. They see directly that 23 is in row 3, column 3. That 50 is the end of row 5. Base-ten becomes spatial.
Shows patterns. Tens are the whole right column (10, 20, 30...). Fives are in column 5 and 10. Etc.
Supports counting. They can follow their finger from 1 to 100 without losing place.
Shows relations. "10 more than 23" = one row down = 33. "1 more than 23" = next cell right = 24.
Ten activities
1. Find the number
"Find 47 in the grid." They search. They get fast over time.
2. Colour patterns
Colour all the tens (10, 20, 30...). Colour all the fives. Colour all the even numbers. They see visually.
3. Hops in ones
They point 1, 2, 3, 4, 5... Walking the finger one cell at a time.
4. Hops in tens
They point 10, 20, 30, 40... Hop down one row at a time. Trains tens-counting.
5. Hops in fives
5, 10, 15, 20, 25, 30... They hop two cells at a time in a pattern.
6. What comes after?
You point at 47. They say what's next to it: 48 (right), 46 (left), 37 (up), 57 (down).
7. Addition on the grid
"23 + 10 = ?" They point at 23, hop down a row to 33. Addition without paper.
8. Subtraction on the grid
"47 - 10 = ?" They point at 47, hop up a row to 37.
9. Number bonds
"Which number + 4 = 10?" They find the pattern. Number bonds to 10.
10. "Guess the number" game
"I'm thinking of a number between 30 and 50." They guess. Train words like bigger, smaller, between, just after.
When should the 100-grid come in?
Age 5: introduce. They see it, get used to it.
Age 6: active work. They can follow 1–100, find numbers, see patterns.
Age 7: addition and subtraction on the grid. A mental-maths tool.
Age 8+: not daily anymore, but it's there as reference.
Patterns in the 100-grid
Once they've coloured patterns they see:
- Tens = right column
- Fives = middle and right column
- Even numbers = every other cell
- Multiples of 3 = pattern diagonally
- Primes = more random
This is rich mathematical sight. They see numbers aren't random.
Once 100 sits
They're ready for:
- Three-digit numbers (101, 102, 200, 500)
- Counting in thousands
- Multiplication to 100
- Decimals
100 is the first real step into mathematics.
Common problems
They can chant 1–100 but can't find 47. Chanting is auditory memory. Finding is visual memory. Different skills. Both need practice.
They tire. 100 numbers is a lot. 5–10 min per session, no more.
They think 100 is after 99. Good! But many 6-year-olds say 99 and stop. Show: 100 is a new row or the start of something new.
Apps and games with the 100-grid
Kluriko Learning Games use the 100-grid in interactive games where they can click and see patterns. Good as a complement to the physical grid on the fridge.
The physical grid wins
Despite digital games — the physical 100-grid on the fridge is better than an app. Why? Because they see it every day. They pass it 50 times a week. They see the patterns passively, store them without effort.
Put one up. Use it. One of the best investments you can make for their maths.
How Kluriko helps
Kluriko Learning Games have the 100-grid built into several games where they can explore patterns, hop, add. A complement to — not a replacement for — the physical grid.