Logic Masters · Ages 11 to 12
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5 levels+40 XP
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5 levels · BeginnerPlay
Logic Masters · Ages 11 to 12
All Logic Masters gamesBIDMAS Priority Tower
Work an expression down step by step, with brackets and indices in the right order. For ages 11 to 12.
BuilderBIDMAS tower: evaluate with brackets and indices~9 min per level5 levelsAll devices
- Free · no account required
- COPPA compliant
- +10 XP per level
- 5 levels
- Plays on all devices
- Curriculum-aligned
The learning journey
Every activity is one step. Here is where this one fits.
- Play(you are here)Learn the idea in a game
- PractiseLock it in on paper
- ReviewCome back and keep it sharp
- MasterTake on a harder challenge
- AchieveEarn a certificate
About BIDMAS Priority Tower
BIDMAS Priority Tower asks what an expression becomes after each step, rather than merely which step comes first. That is the difference between this and our Order of Operations Circuit, and it is a real one: deciding the order is a Grade 5 skill, while carrying the evaluation through as the expression shrinks under you is a Grade 6 one. A child can name the correct order confidently and still lose their place halfway through a four-step expression, and it is the second failure this game is built to catch. Indices are what make it genuinely harder. An index is small, easy to overlook, and easy to misread: three times four squared reads left to right as though the three fours were being squared, which gives 144 rather than 48. The result is far enough out to be obviously wrong and children produce it constantly, because nothing about reading order warns them. Working the tower one row at a time forces the index to be dealt with before the multiplication rather than swept along with it. The name matters too. BIDMAS is the British and Australian form, BODMAS is used in parts of the same curricula, and PEMDAS is American; a student searching for help finds far less under the first two despite them covering the same rule, which is why this game carries the BIDMAS name. Brackets appear from the third level. Free, no sign-up, no advertising to children.
Where to go next
Chosen by the skills this activity practises.
Next — more of the same skill
Printable worksheets for this skill
A hand for grown-ups
- Before you start
- These need thinking time, not speed. Set the expectation that a good puzzle is meant to take a while.
- While they work
- Resist jumping in. A long pause is a child thinking, not a child stuck — give it room before offering a nudge.
- Afterwards
- Ask "how did you work that out?" more than "is it right?". The reasoning is the skill; the answer is just the evidence.
- Watch out for
- Guessing to escape the discomfort of not knowing. Reassure them that being stuck for a bit is normal and fine.
- Away from the screen
- Play strategy games, do puzzles, ask "what comes next?" with patterns of objects. Reasoning is a muscle.
How to play
A question appears on screen
A maths question is shown in large text at the centre of the play area. A timer bar begins counting down from 140 seconds.
Choose the correct answer
Answer options are shown as large buttons. Tap and drag, or use the mouse on desktop. Any input method works — touch, mouse or keyboard.
Build your streak
Each consecutive correct answer increases your streak. A longer streak lights up the flame icon and adds a bonus multiplier to the XP you earn for the level.
Finish the level
Each level has 4 questions. Complete them to earn the full level reward (+10 XP, plus up to +10 XP for a perfect run). Progress is saved locally and shown on the Parent Dashboard.
Curriculum alignment
Mapped to national curriculum frameworks so teachers and parents can match practice to school standards.
- United StatesCommon Core State Standards for Mathematics · order-of-operations, multiplication, additionAligned to order-of-operations, multiplication, addition number and operations objectives.
- United KingdomNational Curriculum for England — Maths · order-of-operations, multiplication, additionAligned to order-of-operations, multiplication, addition number and operations objectives.
- AustraliaAustralian Curriculum v9.0 — Mathematics · order-of-operations, multiplication, additionAligned to order-of-operations, multiplication, addition number and operations objectives.
- CanadaPan-Canadian Provincial Standards · order-of-operations, multiplication, additionAligned to order-of-operations, multiplication, addition number and operations objectives.
Common questions from parents & teachers
Everything you need to know before your child starts playing.
- That game asks which step comes first. This one asks what the expression becomes after each step, which is where children lose their place.
- An index is small and easy to overlook. Three times four squared reads left to right as though the three fours were squared, giving 144 instead of 48.
- Yes, the same rule under three names. Searching under BIDMAS or BODMAS turns up far less than PEMDAS, which is why this game carries the British form.
- From the third level, once indices are secure, so each new element arrives on its own.
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