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L10 · Mental math & market-making
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Squaring in Your Head
Squaring in Your Head
Level 10
●●○○○
Easy
~4 min
Problem
Compute
35
2
35^2
3
5
2
,
85
2
85^2
8
5
2
, and
98
2
98^2
9
8
2
mentally. What general tricks make these instant?
Show a hint (2 available)
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