Use the array to find all the missing numbers. The missing number of rows of 10 is 30. The missing number times three equals 30.
Each row has 10 bricks. Let’s count how many rows there are: one, two, three. There are three rows of 10. Which number do we multiply by three to make 30? We know that three rows of 10 is 30, so 10 multiplied by three equals 30. Three rows of 10 is 30. 10 multiplied by three is 30.