3rd Grade Subtraction and Estimation

Front

What is subtraction?

Back

Subtraction is the process of taking one number away from another. It shows how many are left after some have been taken away.

Front

What does it mean to estimate?

Back

Estimating means finding a number that is close enough to the exact amount, often by rounding to make calculations easier.

Front

How do you subtract two numbers?

Back

To subtract two numbers, you take the second number away from the first number. For example, 5 - 2 = 3.

Front

What is the difference between two numbers?

Back

The difference is the result of subtracting one number from another. For example, the difference between 10 and 4 is 6.

Front

How do you find out how many more one number is than another?

Back

You subtract the smaller number from the larger number. For example, to find out how many more 10 is than 6, you do 10 - 6 = 4.

Front

What is rounding?

Back

Rounding is changing a number to the nearest ten, hundred, or other place value to make it easier to work with.

Front

Estimate 345 to the nearest ten.

Back

345 rounded to the nearest ten is 350.

Front

Estimate 843 to the nearest hundred.

Back

843 rounded to the nearest hundred is 800.

Front

If Jim walked 672 feet and Hannah walked 293 feet, how do you find how many more feet Jim walked?

Back

You subtract Hannah's distance from Jim's: 672 - 293 = 379.

Front

If Kim drove 309 miles on day 2 and 167 miles on day 3, how do you find how many more miles she drove on day 2?

Back

You subtract the miles driven on day 3 from day 2: 309 - 167 = 142.