3rd Subtraction and Estimation

Subtraction is the process of taking one number away from another. It shows how much is left after something is taken away.

Estimating means making a close guess about a number or amount, often rounding to make calculations easier.

To find the difference, subtract the smaller number from the larger number.

The result of a subtraction problem is called the 'difference'.

The difference is 300.

Round 345 to 350 and 63 to 60. Then subtract: 350 - 60 = 290.

Identify the numbers you are subtracting and determine which is larger.

Subtract Liam's distance from Ryder's: 672 - 293 = 379 feet.

Estimate by rounding: 230 - 310 = -80, but the actual difference is 309 - 234 = 75.

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