That's the greatest common factor, or GCF.
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210. The greatest common factor (or GCF) is defined as the largest number that can be divided into two (or more numbers) and result in an integer answer (no remainder). To get the GCF, one factors the numbers involved and takes only the factors that both numbers share (the number of times that they are shared). 210 = 2 * 3 * 5 * 7 1260 = 2 * 2 * 3 * 3 * 5 * 7 Factors shared are 2, 3, 5 and 7, so 2*3*5*7 = 210.
You need to find the common factors in rows and columns. You then need to fill in the two numbers in the blank squares that are shared. Finally, you multiply the common factor numbers to find the number.
You need at least two numbers to find a GCF.
What is the greatest common factor shared by 51 and 21?
You need at least two numbers to find a GCF.