Addition & Estimation

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

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.2.NBT.A.1

CCSS.2.NBT.B.7

CCSS.2.OA.A.1

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.OA.D.8

360 + 490

• 400 + 500 = 900

• 300 + 400 = 700

• 320 + 600 = 920

• 200 + 700 = 900

Round the number 82 to the nearest 10

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Round the number 134 to the nearest 10

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Round 467 to the nearest 100

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Amy rode her bike last weekend. Which is the best estimate of the total number of miles she rode her bike?

• 80 miles

• 60 miles

• 70 miles

• 90 miles

Tags

CCSS.3.NBT.A.1

CCSS.3.NBT.A.2

CCSS.3.OA.D.8

Round to the nearest ten:
752

• 700
• 800
• 750
• 760

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3