27 is the same as _______.

If there are not enough ones to subtract, you _______ to regroup.

Addition and subtraction are _______.

You can check your subtraction with _______.

You can use a _______ for the unknown number.

You _______ use place value and regrouping to subtract.

To find the difference of 46 - 3, do you need to regroup?

To find the difference of 50 - 7, do you need to regroup?

To find the difference of 35 - 8, do you need to regroup?

To find the difference of 29 - 1, do you need to regroup?

There are _______ ones to subtract 6.

There are _______ ones to subtract 5.

There are _______ ones to subtract 4.

The _______ of the parts equals the whole.

You _______ show the parts in any order.

You know the whole, so you can _______ the part you know to find the missing part.

The missing part is 9.

The missing part is 25.

Some students are in the gym. 12 students leave. Now there are 16 students in the gym. How many students were in the gym at the start?

ANSWER: There were 38 students in the gym at the start.

Some key chains are in a bag. Bisan takes out 18 key chains. 15 key chains are left in the bag. How many key chains were in the bag at the start?

ANSWER: There were 33 key chains in the bag at the start.

Tommy counts 40 acorns in his yard. He picks up 20 acorns. Then 16 more acorns fall from the tree. How many acorns are in the yard now?

ANSWER: There are 76 acorns in the yard now.