doubling and halving by DK

In maths I have been learning about doubling and halving. Doubling is when you have the same number like
13+13= double it 10+10=20 3+3=6 20+6=26 so 13+13=26

Halving is dividing a number into 2 like 22 dividing by 2, count in 2s 2 4 6 8 10 12 14 16 18 20 22 count how many 2s have you got so 22 dividing by 2=11

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