How do you write four hundred thirty-nine in standard form?

Round 76 to the nearest ten.

Round 921 to the nearest ten.

Sheyenne has 23 marbles. Jessica has 5 more marbles than Sheyenne does. How many marbles does Jessica have?

Our dog had 6 puppies. We gave away 4. We kept the rest. How many puppies do we have left?

Joey has 5 pencils on his desk, and he has 3 more pencils in his backpack, how many pencils does Joey have all together?

If you had 5 packs of jelly beans and each pack contained 9 jelly beans in each, how many jelly beans would you have?

Which shape has an area of 18?

What is the area?

_{What is the blue hand?}