lesson
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If you had a jar filled with 100 shiny marbles, could you count every single one without losing your place?
When we count by ones, we add just one more marble each time we say a number.
How do all 100 numbers fit together so neatly?
The 100 Chart
A hundred chart organizes all the numbers from 1 to 100 into 10 neat rows of 10.
📊A clean, colorful 10x10 hundred chart showing numbers 1 to 100. Each row of ten has a soft distinct pastel background color (row 1-10 is soft pink, row 11-20 is soft orange, etc.). An animated glowing golden ring slowly sweeps from 1 across to 10 on the top row, then jumps down to 11 and sweeps across to 20, demonstrating how we read numbers left-to-right, row-by-row. Large readable text, modern rounded 8px cells, responsive layout.
You read across each row from left to right: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
What happens when you run out of space at the end of a row?
The Next Family of Tens
Every time you reach a number ending in 9, the very next number starts a new group called a decade.
📊A visual diagram highlighting the transition across decade boundaries. Row ending in 29 shows a friendly frog token sitting on 29. A curved dotted arrow arcs from 29 down to the start of the next row at 30. Below it, a side-by-side comparison shows the same pattern: 39 -> 40, 49 -> 50, with the tens digit highlighted in bold blue and the zero highlighted in bright green. Clear, large labels and simple cartoon icons.
After 29 comes 30, after 39 comes 40, and after 49 comes 50.
It is easy to get stuck at numbers like 29 or 59, but just think of what ten comes next: 2 tens is twenty, so 3 tens is thirty!