Three digit addition/subtraction

Front

What is three-digit addition?

Back

Three-digit addition is the process of adding numbers that have three digits, such as 123 + 456.

Front

What is three-digit subtraction?

Back

Three-digit subtraction is the process of subtracting one three-digit number from another, like 789 - 234.

Front

Estimate the sum of 138 and 309.

Back

The estimated sum is about 400.

Front

How do you find the exact sum of 138 and 309?

Back

Add the numbers: 138 + 309 = 447.

Front

What is the result of 804 - 257?

Back

The result is 547.

Front

How do you find the difference between 589 and 325?

Back

Subtract the numbers: 589 - 325 = 264.

Front

If there are 537 people in a parade and 254 are playing instruments, how many are not?

Back

Subtract: 537 - 254 = 283.

Front

What does 'estimate' mean in math?

Back

To estimate means to find a number that is close to the exact answer, often by rounding.

Front

What is the first step in solving a three-digit addition problem?

Back

Line up the numbers by their place values (hundreds, tens, and ones).

Front

What is regrouping in addition?

Back

Regrouping is when you carry over a value to the next place value when the sum exceeds 9.