Because knowing

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gives you the ability to do

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which gives you the ability to do

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which is what enables you to complete complex problems like

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Arithmetic builds the cognitive abilities and neural connections for algebra. That's why at Vohra Method we build or rebuild arithmetic skills. We make sure our students can do addition, subtraction, multiplication, and division by hand. We also do not allow calculator use.

Arithmetic is to advanced math what lifting weights and running is to sports. They are the skills on which advanced math is based. I know many lazy teachers pretend that arithmetic doesn't matter. They are wrong. That's like saying running doesn't matter for soccer. The cognitive skills you build in arithmetic are the ones that lead to excellence in algebra and calculus.