To multiply a number by 4, double the number twice.
For example: Let’s take 4 × 15 Double 15, we get 30 Now, double 30, we get 60 The answer is 60 So 4 × 15 = 60 Try these at home: 4 × 25 = _____4 × 31 = _____4 × 45 = _____
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