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Chain Math gives you a string of operations to work through in one pass — something like 12 + 7 − 4 + 9 − 3 — and asks only for the number you land on at the end. There is no place to write anything down, so the whole sum has to be carried in your head from left to right. It is the drill that exposes the difference between knowing your arithmetic and being able to hold a running total while you keep calculating.
Pick a chain length and press Start — the clock runs for sixty seconds.
Read the chain from left to right, applying each operation in order.
Type the final total; a correct answer moves straight on to the next chain.
Skip anything you have lost track of rather than restarting it — the clock is the opponent.
Your score is chains completed, with accuracy and pace shown at the end.
Working memory under arithmetic load. Each step forces you to update a number you are already holding, which is a different demand from answering a single fact. That updating is what breaks down first when a longer calculation goes wrong, and it is the part a calculator never trains.
Say the running total to yourself, not the operation. The number you are holding is the thing worth rehearsing.
Round awkward steps and correct at the end: +19 is easier as +20 then −1.
Chunk a long chain into pairs. Two numbers combined and then added on is less to hold than five numbers in sequence.
If you lose the total, skip. Reconstructing it costs more time than the next chain takes.
Yes. Chain Math uses only addition and subtraction so left to right is the correct order — there is no multiplication in the chain to change precedence. For that, try the order of operations drill.
Because you never see the running total. Every step has to be held in memory while the next one is read, which is the part written arithmetic normally does for you.
On the longer levels they can dip below zero mid-chain. The final answer is always a whole number, positive or negative, and a minus sign is accepted.
Compare yourself to your own history rather than to anyone else. A steady pace with high accuracy beats a fast pace with mistakes, because a wrong total in real arithmetic costs far more than a slow one.