Fix the Six
- Explorers
- Levels 1 and 2
- Matchstick puzzle
1 + 3 = 6 is wrong, but don’t touch the 6! Move one matchstick to make it true.
Move one matchstick so the sum is true.
This one comes back on . You can solve it then, signed in.
Last set on . The answer stays inside Kiwimath, and here is why.
What the board shows
- As laid out, the sum reads 1 + 3 = 6, which is not true.
- There are 17 matchsticks on the table, and the same 17 must still be there after the move.
- You may move one stick, and only once.
How do matchstick puzzles work?
The sum is built from matchsticks, with each figure made the way a calculator shows it: seven places for a stick, like an 8 with every stick in place. The plus sign is two sticks, the minus sign one, and the equals sign two.
A move means picking up one stick and putting it down somewhere else. It can go back into the same figure, into a different figure, or into a sign. Nothing can be thrown away or added from outside.
After the move every figure has to be a proper digit and the sum has to be true. A child who finds a true sum can check the move by counting the sticks: there should be exactly as many as at the start.
What it trains: Number sense, careful checking and seeing digits as shapes.
Puzzles like this are part of olympiad preparation from the first classes. See the plan for Class 1 or Class 3.
What to ask while your child works
Questions like these keep a child thinking without giving anything away. They work for every puzzle of this kind.
- Can you read the sum aloud and say why it is not true?
- How many sticks does each figure use?
- After your move, did the number of sticks stay the same?
Warm up with one like Fix the Six
This warm-up is not the puzzle above, and its answer is below. It is a different puzzle of the same kind, made for this page, so your child can practise before Fix the Six comes back.
Move one matchstick so the sum is true.
See the warm-up answer
The sum becomes 3 + 4 = 7.
- Nine take away four is five, not seven. Turning the minus into a plus needs one more stick, so find a figure that can spare one.
- Take the top-left stick from the 9. It becomes a 3.
- Lay the stick upright across the minus sign to make a plus.
- Now it reads 3 + 4 = 7.
Questions parents ask about Fix the Six
When can my child solve Fix the Six?
Fix the Six is due back as the Explorers puzzle of the week on Saturday 19 December 2026, opening at 6 PM India time. Your child can solve it then, signed in, with hints that open one at a time.
Who is Fix the Six for?
It is an Explorers puzzle, for Levels 1 and 2, roughly Class 1 to 4. A younger child can try it with a grown-up reading the story aloud; the thinking matters more than the reading.