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Explain how using basic facts can help you find 10x20x30x40 mentally.

Plz I need help on what this means. How do I solve this???

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Mark M. | Mathematics Teacher - NCLB Highly QualifiedMathematics Teacher - NCLB Highly Qualif...
4.9 4.9 (188 lesson ratings) (188)
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(10)(20)(30)(40)
(1)(2)(3)(4)(10)(10)(10)(10)
(24)(10000)
240000