Split the number into tens and ones. The square is the tens squared, plus two times tens × ones, plus the ones squared — three easy pieces you add in your head.
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
🏁 Lesson 18 test
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
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