The math module (also called the calculator module) is one of the most confusing modules in BOMBANANA! because its solution is a two-stage input — and because the community tables floating around for it contradict each other. This guide walks through the verified flow and explains exactly how to read the answer table without getting your team blown up.
How the Math Module Works — The Two-Stage Flow
The module shows an arithmetic expression (for example, 67+2) and a keypad with braille digits. Three independent sources — community walkthroughs with screenshots, Steam discussion answers, and recorded playthroughs — all confirm the same two-stage sequence:
- Stage one: the Deaf reads the expression aloud, and the Blind types in the answer to the arithmetic first. For 67+2, the Blind enters 6, then 9.
- A light activates after the first number is entered. The Deaf calls out its color.
- Stage two: the Mute looks up the manual's table — the arithmetic result's parity (odd or even) combined with the light color — and the Blind types the second number the table gives.
Both inputs must happen in the same sequence. Skipping stage one and typing only the table number makes the module completely unresponsive. This exact trap is documented in a Steam help thread: a player read "green light, 56+8", typed the even/green answer directly, and the module did nothing — because the answer 64 had to be entered first before the light lookup applies.
The Answer Table
A community-captured table for the math module looks like this:
| Arithmetic result | Red light | Green light | Yellow light | Blue light |
|---|---|---|---|---|
| Even | Press 5 | Press 9 | Press 0 | Press 1 |
| Odd | Press 3 | Press 2 | Press 7 | Press 0 |
Treat this table as a worked example, not gospel. The walkthrough it comes from contradicts itself — the author's own example (an odd result with a green light, answered with 9) disagrees with the table's odd/green cell (2) — which is direct evidence that the manual contains variants, so different bombs can run different mappings. The in-game manual held by the Mute is the single authority; if the Mute's book disagrees with any online table, the book wins.
The Three Pitfalls
- Skipping stage one. Covered above — no first number, no reaction. If the module ignores your input, the first thing to check is whether the arithmetic answer was entered.
- The keypad is scrambled. The braille digits are not laid out in order. The Blind presses the digit itself, wherever it physically sits — do not press a position assuming the layout.
- The priority trap. An arithmetic result can satisfy more than one condition at once (for example, both odd and greater than five). The Blind must never pick a branch alone — the branch is decided by the Mute, because only the Mute can see the manual's rule for the current light and round.
One Known Quirk: The LED That Doesn't Light
Players have reported rounds where the math module's LED simply does not light after stage one. With no light color, every lookup table becomes useless — the community consensus so far is that this is either a bug or an intentional variant. If it happens to your team: do not guess. Check whether the round column in the manual covers a no-light case, and if not, treat the module as broken and prioritize the rest of the bomb.
A Team Workflow That Works
- Deaf: read the expression digit by digit, then confirm the Blind's readback of the answer before it gets typed.
- Blind: enter the arithmetic answer, then announce which key you pressed so the Deaf can verify.
- Deaf: call the light color the moment it appears.
- Mute: confirm the round column first, then parity × color, then gesture the final digit. Remember there is no zero gesture — agree beforehand that, say, ten-plus-head-shake means zero.
- Blind: read the final digit back, get the confirm, press.
Why This Module Punishes Fast Teams
The math module feels like it should be the fastest module — it is just arithmetic. In practice it eats strikes because it combines three failure modes at once: staged input, scrambled keypad, and branch selection. Slow down on the first math module of each session, verify every step of the chain, and it becomes one of the most reliable modules on the bomb.
For the other lookup-based modules, see the direction module guide and the wires module guide — and remember that every table on this wiki carries the same variant warning, because the manual your Mute is holding is the only one that matches your bomb. In a hurry? The solver gives the single answer for your exact two inputs.
This page is a community guide — strategies reflect the launch version (September 2026) and may shift after patches. The in-game defusal manual is always the final authority.