Unit 2 Lesson 8 in Math

Unit 8 Math Review - Part 2

Rounding

• You can round to subtract ... 45 - 12 is the same as 50 - 10 = 40

• Think about what the number is close to ... 684 is closer to 700 than 600

Multiple Choice

Estimate to the nearest 10 - 641 - 212

• 640 - 220 = 220

• 640 - 210 = 430

• 650 - 220 = 430

• 650 - 210 = 440

Multiple Choice

Estimate to the nearest 10: 874 - 526

• 880 - 520 = 360

• 880 - 530 = 350

• 870 - 520 = 350

• 870 - 530 = 340

Open Ended

Estimate to the nearest 10: 847 - 615

Rounding with multiple steps

Sometimes you have to ADD and SUBTRACT while working out the problem

Multiple Choice

Jen has $500. She bought soap for $125 and a book for $213. How much money does Jen have left?

• 200

• 300

• 100

• 400

Multiple Choice

Jen has $700. She bought soap for $195 and a book for $193. How much money does Jen have left?

• 100

• 300

• 0

• 400

Addition Table

You can use the addition table to figure out the properties of addition

Multiple Choice

Look at the highlights, what property can you see?

• Associative Property because 0 + 5 = 5

• Commutative Property because 0 + 5 = 5

• The Identity Property because 0 + 5 = 5

Multiple Choice

Look at the table, what property do you see?

• Identify Property because 6 + 3 = 3 + 6

• Associate Property because 6 + 3 = 3 + 6

• Commutative Property because 6 + 3 = 3 + 6

Rounding multiple numbers

Sometimes you will have to round 3-4 numbers and add them up. This can be challenging. Let's practice

Multiple Choice

Round these numbers to the nearest 10 and add:

178 + 202 + 154 + 103

• 380

• 540

• 630

• 480

Multiple Choice

Round these numbers to the nearest 10:

108 + 159 + 188 + 204

• 660

• 470

• 570

• 310

Are there any questions?

Please meet me in performance matters to finish up our assessment! You CAN do this :)

Multiple Choice

Estimate to the nearest 10 - 641 - 212

• 640 - 220 = 220

• 640 - 210 = 430

• 650 - 220 = 430

• 650 - 210 = 440