Grade 3 Think Up Unit 13

Front

What is a sum?

Back

The answer to an addition problem.

Front

What are compatible numbers?

Back

Pairs of numbers that can easily be computed mentally, such as 23 + 27 is close to 25 + 25 so the estimate is 50.

Front

What does it mean to round a number?

Back

To approximate a number to the nearest ten, hundred, thousand, etc.

Front

What does it mean to add?

Back

To combine two or more groups.

Front

What is a difference?

Back

The answer to a subtraction problem.

Front

What is subtraction?

Back

The process of taking away one number from another.

Front

What is multiplication?

Back

The process of combining equal groups to find the total.

Front

What is division?

Back

The process of splitting a number into equal parts.

Front

What is an estimate?

Back

An approximate calculation or judgment.

Front

What is a fraction?

Back

A part of a whole, represented by a numerator and a denominator.