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Mathematics
Arithmetic
Addition and Subtraction, Greatest Common Factor (GCF)
adding and subtraction number using greatest common factors 940-420=? 169-26=? 15+75-45=? 48+16=? 17+51=? What is the GCF?
1 answer
940 = 20*47
420 = 20*21
940-420 = 20(47-21) = 20*26 = 520
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