Thief of Time - Algebra

“What precisely was it you wanted, madam?” she said. “It’s only that I’ve left the class doing algebra, and they get restless when they’ve finished.”

“Algebra?” said Madam Frout, perforce staring at her own bosom, which no one else had ever done. “But that’s far too difficult for seven-year-olds!”

“Yes, but I didn’t tell them that and so far they haven’t found out,” said Susan. It was time to move things along. “I expect you wanted to see me about my letter, madam?” she said.

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The Thief of Time - p99