Mason has six boxes with 10 crayons in each box. How many crayons does he have altogether? How many groups of 10 does he have?
We know that Mason has six boxes, and each box has 10 crayons. You may have noticed that each box contains these marks. These are called tally marks. Each group represents five. And we know that two lots of five is 10. So, these tally marks are used to show that there are 10 crayons in each box.
So, if Mason has six boxes and each box has 10 crayons, we need to calculate six times 10 or six lots of 10 to help us find out how many crayons Mason has altogether. So, we could count in 10s on our number line six times to find the answer. One 10 is 10, two 10s are 20, three 10s are 30, four 10s are 40, five 10s are 50, six 10s are 60. Six times 10 is 60.
The second part of the question asks us how many groups of 10 Mason has. We already know that Mason has six boxes and each box contains 10 crayons. So, we could just replace the word boxes with the word groups. Mason has six groups. So, Mason has 60 crayons altogether. Six boxes with 10 crayons is the same as saying six groups of 10 or six multiplied by 10. So, Mason has six groups of 10. The answer to the first part of the question is 60. And the answer to the second part is six.