Grade 3 Think Up Unit 13

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 add?

Back

To combine two or more groups.

Front

What is the difference in math?

Back

The answer to a subtraction problem.

Front

What is an estimate?

Back

An answer that is close to the exact answer.

Front

What does it mean to regroup numbers?

Back

To rename a number such as 10 ones = 1 ten, 10 tens = 1 hundred, 10 hundreds = 1 thousand.

Front

What is subtraction?

Back

The process of taking one number away from another.

Front

What is the sum?

Back

The total amount you get after adding numbers.

Front

What is a number line?

Back

A straight line that represents numbers in order, used for addition and subtraction.

Front

What is a fraction?

Back

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

Front

What is multiplication?

Back

The process of adding a number to itself a certain number of times.