Mr. Riley has 2 packs of pencils with 5 pencils in each pack. He gives four of the pencils to his students. How many pencils does he still have?

300 + ____ = 1,200

What is the rule for the following problem: 100, 75, 50, 25

30 + ____ = 120

What is the rule for the following problem: 2, 4, 6, 8, 10, 12

27 - 8 =

You have 2 rows of chairs with 9 chairs in each row. How many chairs do you have in all?

What is the rule for the following problem: 4, 8, 16, 32

What is the rule for the following problem? 3, 9, 27

One python clutch has 31 eggs. Another python clutch has 19 eggs. How many more eggs are in the first clutch?

Share 20 marbles equally among 5 friends. How many marbles do each friend get? Are there any left over?

57 - 8 =

17 - 8 =