Free Interactive Marble Jar
Drop marbles in groups, practice running totals, estimate quantities and compare jars to build number sense, mental addition and difference skills in a visual way.
⭐️ Best used in full screen mode!
Teacher Notes
Curriculum Links:
This tool supports the Number strand of the Irish Primary Mathematics Curriculum, particularly the strand units Numeration and Counting and Sets and Operations. It develops early work in counting, estimating quantities, comparing sets, combining quantities, addition and subtraction strategies. It is most suitable for Junior Infants – 2nd Class, covering Stage 1 and Stage 2 of the curriculum.
Children can use the Ten Frame to:
count collections of marbles, add groups while keeping a running total, estimate quantities after a brief visual display, compare two sets using more, less and equal, find the difference between quantities, check estimates by counting, and develop flexible mental addition and subtraction strategies. Marble Jar
The visual and playful nature of the activities also supports the curriculum’s emphasis on children reasoning, estimating, discussing strategies and solving mathematical problems rather than simply carrying out calculations.
Lesson Ideas
Running Total
Choose a marble colour and drop marbles into the jar in groups of 1–10. Keep the total hidden and ask children to keep a running total in their heads after each drop. Reveal the total at the end to check. Marble Jar
Flash and Estimate
Show a jar of marbles for three seconds, then cover it. Ask children, “How many do you think were there?” and “What helped you estimate?” Reveal the total afterwards and discuss whether the estimate was too high, too low or exact. Marble Jar
Which Jar Has More?
Display two jars and ask children to decide which contains more marbles, or whether they are equal. Then ask, “How many more?” to develop comparison language and early subtraction through finding the difference. Marble Jar
Count in Groups
Set the drop amount to 2, 5 or 10 and repeatedly add the same-sized group to the jar. Ask children to predict the new total before each drop, reinforcing skip counting and repeated addition. Marble Jar
Make the Target
Choose a target number such as 20, 30 or 50. Children decide which groups to drop into the jar to reach the target exactly. Encourage different solutions, such as 5 + 5 + 10 or 8 + 7 + 5, to build flexible number composition and mental calculation.
Related Tools
Check out some other interactive tools to help children with number sense.
Want More Visual Maths Tools?
Browse the full library of free interactive maths tools for primary classrooms.
