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Counting by two is the same as the two times table, which is multiplying by two.
because there the same
Adding doubles can help you multiply by 2 through the property of commutativity in multiplication. By adding two equal numbers together (doubles), you are essentially multiplying one of the numbers by 2. For example, 5 + 5 = 10, which is the same as 5 x 2 = 10. This strategy can simplify multiplication problems and help build a deeper understanding of the relationship between addition and multiplication.
It depends on how good your mental maths is: 29 = (23)3 = 83
It is only because we count in tens - and 5 10 and 2 are factors.
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