MATCHSTICKS
Matchsticks, one stick to fix.
Move (or add/remove) one matchstick to make the equation true. Reveal the answer or grade your own equation.
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Solution animation · move one stick
Study the equation: where to add one stick?
What is this?
Equations are drawn with seven-segment digits. Decide which matchstick to move, reveal the answer, or type your equation and click “Check”.
示例与注意事项Example & notes
一个例子A worked example
移动一根火柴让 6+4=4 成立：把 6 变成 5 的那根火柴挪到右边 4 的左侧，把它变成 9，得到 5+4=9。Move one match to fix 6+4=4: turn the 6 into a 5 and place that match to turn the right-hand 4 into a 9, giving 5+4=9.
注意事项Things to watch
- 先看等号两边是否相等，再考虑「改哪个数字最省火柴」。Check both sides first, then look for the digit that costs the fewest matches to change.
- 8 用 7 根火柴，0/6/9 用 6 根——根数变化往往就是突破口。An 8 uses seven matches while 0, 6 and 9 use six — counting matches is often the key.
- 运算符号也能改：把 + 变成 − 是常见的一步。Operators can move too: + turning into − is a common single-move fix.
相关问答More Q&A
一道题有几种解法？How many solutions does a puzzle have?
常见题目通常 1–2 种；页面给出一种并允许继续寻找其他解法。Usually one or two; the page shows one and lets you keep hunting for others.
适合多大孩子？What age is it for?
小学中高年级较合适，重点在观察、试错与验证。Upper primary works well — it trains observation, trial and verification.