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Maths on the Back of an Envelope: Clever ways to (roughly) calculate anything. An entertaining introduction to mental maths and problem solving
Amazon Price History
This is our record of Amazon price changes for Maths on the Back of an Envelope: Clever ways to (roughly) calculate anything. An entertaining introduction to mental maths and problem solving (0008444498) since we began monitoring it.
| Price Type | Lowest Ever | Highest Ever | Current + | Average |
|---|---|---|---|---|
| Amazon | (Jun 23, 2026) | (Jun 23, 2026) | 0,00 € (Jun 23, 2026) |
0,00 €
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Jun 23, 2026 10:33 PM
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