MathGrade 7ages 12–13
❄️ Above and below zero
A child who's fine with 5 being bigger than 2 will confidently say minus 5 is bigger than minus 2 too — because the habit of "bigger digit, bigger number" doesn't know to flip below zero.
Try this lesson freeNo card needed. The first lesson is free.
Download on the App StoreWhat your child learns
- Right of zero goes up, left of zero goes down.
- The further left of zero you go the smaller the number, even though the digit grows.
- Minus 5 is colder than minus 2, because it sits three steps further down.
- Adding moves right on the line, subtracting moves left — even when crossing zero.
The mistake most kids make here
Thinking minus 5 is bigger than minus 2 because five is bigger than two.
Try one question
Minus 5 degrees or minus 2 degrees. Which is colder?
Minus 5 against minus 2
- minus 5
- minus 2
- the same
Answer
minus 5 — That's it. Three steps below minus 2.
How Maya teaches it
Your child tells Maya what they did in class. She teaches this topic at her desk, asks questions with tappable answers, and when the answer is wrong she explains why that answer was tempting instead of saying “try again”. She remembers what did not land and comes back to it.
Your child has it when they can: Say which is colder, minus 5 or minus 2.
How to help at home
This misconception makes sense on its own terms: for every positive number your child has ever compared, a bigger digit meant a bigger amount. Negative numbers are the first place that rule breaks.
Use temperature, since children already know cold and colder. Ask: "which is colder, minus 5 degrees or minus 2 degrees?" Draw a number line with zero in the middle if it helps to see it.
When your child says minus 5 is "bigger" because 5 is bigger than 2, say: "on this side of zero, further from zero means colder, not bigger. Minus 5 is three steps colder than minus 2." Walking a finger down the number line while saying this makes the direction concrete.
A sign they've got it: they can order a small set of negative numbers, like minus 8, minus 1, and minus 4, from coldest to warmest without needing the temperature story every time.
Questions parents ask
- Why does my child think minus 5 is bigger than minus 2?
- They're applying the rule that works for every positive number they've ever seen — bigger digit, bigger amount — to a place where it doesn't apply. Below zero, further from zero means smaller, not bigger.
- What's a good way to introduce negative numbers?
- Temperature and money owed both work well because children already have real intuition for "colder" and "owing more" being worse, not bigger. A number line with a clear zero in the middle helps anchor the direction.
- How do I explain why moving left on the number line makes a number smaller?
- Show it stepwise: starting at minus 2 and moving three more steps left (further from zero) lands on minus 5, and each step down is colder — so further left is smaller, even though the digit grew.
- How does Maya teach negative numbers?
- Maya uses a temperature scale and a number line together, and has the child compare pairs of negative numbers by direction from zero rather than by the size of the digit.
No card needed. The first lesson is free.
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