Anna and her brother were collecting seashells. She collected s seashells and her brother collected twice as much

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The answer is 30 minutes to an hour

This law is sometimes called the grouping property. as you can see, regardless of how the numbers are grouped, the answer is still 13. the associative law of multiplication is similar to the same law for addition. it says that no matter how you group numbers you are multiplying together, you will get the same answer.