Estimation: Addition

Estimating is to....

• find the exact answer

• Estimating makes it EASY to solve the problem, so you want find an answer close to the exact answer

• use any numbers in the problem

You know your answer is reasonable if _______________

• It is 100 away from your estimate

• it is close to your estimate

• if it is far away from your estimate

• if it is in a ballpark

Estimate the answer:

906 + 397

• 1300

• 1200

• 1310

• 1303

Tags

CCSS.3.NBT.A.1

CCSS.3.NBT.A.2

CCSS.3.OA.D.8

Estimate the answer:

578 + 720

• 1300

• 1200

• 1290

• 1298

Tags

CCSS.3.NBT.A.1

CCSS.3.NBT.A.2

CCSS.3.OA.D.8

Cale bought 231 cows and Lisa bought 392 cows. About how many total cows did they buy?

• 600 cows

• 500 cows

• 200 cows

• 100 cows

Tags

CCSS.3.NBT.A.1

CCSS.3.NBT.A.2

CCSS.3.OA.D.8

Hollis jogged 278 laps last month. Her friend Hartley jogged 263 laps. How many laps did they jog combined?

• 421 laps

• 541 laps

• 531 laps

• 431 laps

Tags

CCSS.3.NBT.A.2

Estimate 359 + 481

• 360 + 480

• 350 + 450

• 300 + 500

• 400 + 600

Tags

CCSS.3.NBT.A.1

CCSS.3.NBT.A.2

360 + 490

• 400 + 500 = 900

• 300 + 400 = 700

• 320 + 600 = 920

• 200 + 700 = 900