Dish balance with Weighted Number & Weights for School Maths Lab

Quick Answer: Dish balance with Weighted Number & Weights for School Maths Lab is a two-pan balance used with numeral pieces weighted according to the number they show, plus separate weights. On the dish balance, 3 and 5 placed in one pan balance 8 in the other, so equality becomes something students see.

Equality You Can See Level Out

Many pupils read the equals sign as ‘and the answer is’, which causes trouble later when they meet statements such as 8 = 3 + 5 or 3 + 5 = 4 + 4. A balance fixes the meaning. The two pans are level only when both sides carry the same amount, so the sign stands for ‘balances’ or ‘is the same as’. In the usual design of weighted numbers, each numeral piece is weighted in proportion to its value, so a 6 weighs the same as six 1s or as a 2 and a 4 together.

With that idea in place, the balance supports a sequence of lessons. Young pupils find all the pairs that balance 10. Next come missing-number problems: put 5 and an empty space in one pan and 9 in the other, then ask which numeral makes the pans level. That is the equation 5 + ? = 9, and it is early algebra in a form a seven-year-old can solve. Unbalanced pans show greater than and less than just as clearly.

The separate weights in the title extend the balance to measurement of mass. Students compare classroom objects, find which is heavier and, depending on the weights supplied, balance an object against a number of equal units to measure it.

Applications

• Showing number bonds, such as every pair of numerals that balances 10
• Teaching the equals sign as ‘balances’ rather than ‘gives the answer’
• Solving missing-number problems like 5 + ? = 9 by trial on the pans
• Demonstrating greater than and less than with pans that do not level
• Comparing and measuring the mass of small objects with the weights

Specifications

Care & Handling

• Set the dish balance on a level table and check that the empty pans balance before each lesson.
• Place pieces into the pans gently; dropping them jolts the pivot.
• Count numeral pieces and weights back into their box, since a missing numeral leaves gaps in number work.

Why Choose LabEquip

Early-years and primary teachers who want equations to make sense before symbols take over are the usual buyers. LabEquip lists this balance in Mathematics School Lab Products with the Cuisenaire Strips that model number bonds as lengths; get in touch via the contact page.

Frequently Asked Questions

How do the weighted numbers work?

Each numeral piece is weighted according to the number it shows, so a 7 weighs the same as seven 1s. When numerals are placed in both pans, the balance levels only when the totals on each side are equal.

How does the balance teach the meaning of the equals sign?

The pans are level only when both sides hold the same amount, so pupils learn that equals means ‘is the same as’. That makes statements such as 8 = 3 + 5 and 3 + 5 = 4 + 4 feel natural rather than wrong.

How are missing-number problems solved on the balance?

Put the known numerals in place, for example 5 in one pan and 9 in the other, then try numerals alongside the 5 until the pans level. The numeral that works, 4, is the missing number.

Can the balance show greater than and less than?

Yes. The pan holding the larger total sinks and the other rises. Pupils read the result as a statement such as 6 + 3 is greater than 8, and then adjust the pans to make them equal.

What are the separate weights used for?

They let pupils compare and measure the mass of small classroom objects on the same balance. Whether they are equal units or graded masses should be confirmed when you enquire, since that decides which measuring activities are possible.

How should the balance be prepared before a lesson?

Stand it on a flat, steady table and check that the empty pans hang level. If they do not, use any adjuster the balance has, or note the difference, so results are not thrown off from the start.

Last Updated: September 2026