Grade 3 Think Up Unit 13

Front

What is an estimate?

Back

An answer that is close to the exact answer.

Front

What is an addend?

Back

A number that is added to another number.

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 regroup?

Back

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

Front

What is addition?

Back

The process of finding the total by combining two or more numbers.

Front

What is subtraction?

Back

The process of finding the difference between two 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 finding the total when one number is taken a certain number of times.