Number Chain

Start from a number, then another step comes — + 8, − 13, × 3, ÷ 4 — each worked on your last answer. Type the new total and the next step is already waiting. How far can you carry it in a minute?

Number Chain trains working memory as well as arithmetic: every step is applied to the total you just typed, so you carry the running answer in your head. How far can you take it in a minute?

How to play Number Chain

You are given a number to start from.
A step appears — + 8, − 13, × 3, ÷ 4. Apply it to your last answer and type the new total.
The next step is already waiting. A wrong answer clears and the same step waits.
The chain never goes below zero and every division comes out whole.

Scoring

Each step is worth points by its operation, more on harder levels.
A run of right answers builds a combo that multiplies your points.

No clock

Choose No clock to play twenty sums, however long they take. A wrong answer still only breaks your combo, and a no-clock game keeps its own best, apart from the minute’s.

Tips

Say the running total to yourself as you type it — it is easier to keep.
Multiply and divide by splitting: × 3 of 47 is 3 × 40 plus 3 × 7.
Choose one operation to drill, such as subtraction, before playing them mixed.

Play it with friends

On your own, against the characters — each plays the game by its own rules the moment it starts, so there is always somebody to beat.
With friends, each on their own phone or laptop: one of you shows a code, the others type it in, and everybody gets exactly the same game on the same Go.
Taking turns on one device — pass it round, and each turn is scored against the turns before.

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