Adding and Subtracting Three-Digit Numbers

Front

What is a three-digit number?

Back

A three-digit number is a number that has three digits, ranging from 100 to 999.

Front

What does it mean to add numbers?

Back

Adding numbers means finding the total or sum by combining two or more numbers.

Front

What does it mean to subtract numbers?

Back

Subtracting numbers means finding the difference by taking one number away from another.

Front

What is the sum of 678 and 432?

Back

1110

Front

What is the difference between 876 and 543?

Back

333

Front

What is the result of subtracting 567 from 890?

Back

323

Front

What is the sum of 456 and 321?

Back

777

Front

How do you check your addition?

Back

You can check your addition by adding the numbers again or by using subtraction to see if the total matches.

Front

How do you check your subtraction?

Back

You can check your subtraction by adding the difference to the smaller number to see if it equals the larger number.

Front

What is regrouping in addition?

Back

Regrouping in addition is when you carry over a value to the next column when the sum exceeds 9.