Ten of them.
16
Two groups of five is ten
130
130
130
130
To determine the number of groups of 3 in 30, we need to divide 30 by 3. The result is 10, which means there are 10 groups of 3 in 30. Each group consists of 3 items, and there are a total of 10 such groups in 30.
there are 10 groups of 10
130 84+6=90 46-6=40 90+40=130
130
To round 131 to the nearest ten, we look at the digit in the tens place, which is 3. Since 3 is less than 5, we round down. Therefore, 131 rounded to the nearest ten is 130.