Estimating Sums

Finish the sentence:

Estimating is ...

• An exact answer.

• A random guess

• A guess that is very close to the actual number.

• Another word for equal to.

Estimate to the nearest ten.

578

• 600

• 570

• 580

• 575

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Estimate to the closest hundred:

323

• 320

• 400

• 350

• 300

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

What is a compatible number?

• Rounding

• A number that is equal.

• A number that is close to the number being used, but easier to add with.

• When we round to the nearest tens place.

Estimate:

413 + 235

Estimate to the nearest tens:

78 + 122

What can be a compatible number with 487?

• 500

• 480

• 485

• 490

• 400

Tags

CCSS.1.OA.C.6

CCSS.2.OA.B.2

What can be a compaitble number with 93?

• 90

• 100

• 95

• 80

Tags

CCSS.2.NBT.B.7