Unit 23 · Indices
Indices
Mathematics · Grade 7
What You Will Be Able To Do
🔢Use the index laws, and rebuild any of them if you forget
0️⃣Explain why anything to the power zero is 1, in two ways
➖Handle negative indices, and see why answers stay positive
🔭Write very large and very small numbers in standard form
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Every law in this unit comes from writing the copies out and counting them, so nothing here has to be taken on trust.
Presenter notes: Open with a claim nobody believes. Say that a sheet of newspaper folded thirty times would be taller than the highest mountains, and take a vote on whether that could possibly be true. It is, and the class will find out why later in the lesson. Then write 2³ on the board and ask for its value, expecting some to say six.