Unit 3 Estimating Word Problems

Estimating is finding a number that is close enough to the right answer, often by rounding numbers.

Look at the tens digit: if it's 5 or more, round up; if it's 4 or less, round down.

SIDES√ helps to organize information and solve problems step by step.

Round 334 to 300 and 278 to 300, then add: 300 + 300 = 600.

Finding the difference means subtracting one distance from another to see how much more or less one is.

Round 271 to 300 and 487 to 500, then add: 300 + 500 = 800.

Lori lives about 272 miles from her grandparents.

Subtract the distance to her aunt from the distance to her grandparents: 272 - 411.

Round 312 to 300 and subtract from 900: 900 - 300 = 600.

The estimated distance is found by using the table of distances.