Ask a friend to pick two small numbers and write them down. Each next number is the sum of the two before it — a leapfrog list — until there are 10 numbers. You glance at the list and say the total at once: it is always 11 times the 7th number!
Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
🏁 Trick 25 test
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the
🐸 Leapfrog Legend badge when you pass — and a certificate when you finish all 10 tricks of
Part 4 · Clever counting & checking. You can still take the test without signing in.
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