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To double the number 14 means to multiply it by 2. Therefore, double 14 is equal to 28. This can be calculated by simply adding 14 + 14, or by multiplying 14 by 2.
28 - just double alternating numbers
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2x7=14double = 4x7= 28
Yes - for example, 7 x 2 = 14, doubling one of the numbers gives 14 x 2 = 28 or 7 x 4 = 28.