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The content is interactive and helps in doing faster calculations using formulas. It consists of 4 levels: Level 1. Use formula (a + b)2 = a2 + b2 + 2ab  to fill the gaps.
Level 2. Link formulas by squaring expression (a + (-b))2
Level 3. Compare different methods to square 101 or 99. Get the conclusions that using an identity makes it easier.
Level 4. Practice using identities to square numbers.

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License:[Source Dragonlearn ]April 8, 2020, 12:39 p.m.