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### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# Interactive Balance

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### Worms

### Buzzy Bee

### Fair Exchange

Links to the University of Cambridge website
Links to the NRICH website Home page

Nurturing young mathematicians: teacher webinars

30 April (Primary), 1 May (Secondary)

30 April (Primary), 1 May (Secondary)

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Age 5 to 11

Challenge Level

- Interactive environment
- Teachers' Resources

Explore our interactive balance environment, or scroll down for some instructions.

You can drag numbers 1-9 from the table onto the balance trays.

You can create larger numbers using the calculator tool - simply enter the number using the keys.

Clicking on 'OK' puts a box around your number, which you can now drag to one side of the balance.

You can also use the calculator tool to create one side of a number sentence (e.g. 17-2).

Clicking on 'OK' again makes a box around it, which you can drag onto the balance.

As you drag a number or number sentence onto a tray, you will know when you can 'drop' it in place as the balance will become a slightly lighter colour.

You can take numbers/number sentences off a tray at any time.

Place this "worm" on the 100 square and find the total of the four squares it covers. Keeping its head in the same place, what other totals can you make?

Buzzy Bee was building a honeycomb. She decorated the honeycomb with a pattern using numbers. Can you discover Buzzy's pattern and fill in the empty cells for her?

In your bank, you have three types of coins. The number of spots shows how much they are worth. Can you choose coins to exchange with the groups given to make the same total?