Hundred Chart
An interactive hundred square: colour the multiples, discover patterns, step through the sieve of Eratosthenes and play Guess my number.
Free, runs in the browser, no sign-in or installation.
- Subject
- Mathematics
- Area
- Numbers
- Level
- Primary school
What you can do
- Colour the multiples of one or more numbers from 2 to 99; the app lists the common multiples and points out column and diagonal patterns.
- Students can also colour the multiples of a given number themselves and check their answer; missed and wrongly coloured numbers are marked.
- Go through the sieve of Eratosthenes step by step, with an explanation of each step, or let students sieve the chart themselves and check.
- In Guess my number, students cross out the numbers that do not fit the clues; choose a level or write your own clues.
- Change the range (to 100 or 200) and the number of columns (10, 9 or 6), print worksheets or save the chart as a PNG.
Pictures in the Gallery10
Ready-made pictures made in this app, to download as PNG.
Worksheets and lessons
Lessons with worksheets that use this app.
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Place Value BlocksBase ten blocks for place value, regrouping, decimals and comparing numbers.
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