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No matter how simple it may be solving mathematical equations can be a challenge for quite a number of persons. Through his book titled "Secret Of Mental Math Arithmetic: 70 Secrets To Super Speed Calculation & Amazing Math Tricks" Jason

Produktbeschreibung
No matter how simple it may be solving mathematical equations can be a challenge for quite a number of persons. Through his book titled "Secret Of Mental Math Arithmetic: 70 Secrets To Super Speed Calculation & Amazing Math Tricks" Jason