At the end of this lesson, students should be able to double numbers and halve even numbers.
When we talk about halves (Half =1/2), we are talking about sharing or dividing objects or items into two equal parts e.g. 1/2 of 2 = 1
This means that sharing 2 or dividing 2 into equal parts will give us one (1).
ALSO
1/2 of 6 = 3 AND 1/2 of 4 = 2
In the same way, we can say that the opposite of sharing or dividing by 2 is doubling. Doubling is multiplying a number by 2 or adding a number to itself.
E.g. Double 2 = 4
Double 2 can be written as 2 x 2 = 4 OR2 + 2 = 4
Double 3 = 6 i.e 2 x 3 = 6 OR 3 + 3 = 6
We can therefore conclude that the opposite of halving is doubling. Therefore: