Unit 8 Review - Part 1

Unit 8 Review - Part 1

Rounding

• Locate the place - 278

• This is the TENS place

• See what it is closer to .... is 278 closer to 270 or 280?

• 78 is closer to 80 ... so the answer is 280

Multiple Select

Select all the numbers below that would round to 250 when rounded to the nearest ten.

• 253

• 275

• 248

• 255

• 254

Multiple Select

Select all the numbers below that round to 550 when rounded to the nearest ten

• 498

• 551

• 554

• 549

• 450

Multiple Select

Select all the numbers that round to 880 when rounded to the nearest ten.

• 881

• 879

• 875

• 882

• 888

Rounding

• You can also round to the nearest hundreds spot

• 678 .... this is the hundreds spot

• 678 is between 600 and 700 ....

• 678 rounded is 700 because its closer to 700

Multiple Choice

There is a 3 digit number with 2, 3, 7. Rounded to the hundred it would be 300. What is the number?

• 237

• 327

• 732

• 723

Multiple Choice

There is a 3 digit number with 7, 5, 3. Rounded to the hundred it would be 800. What is the number?

• 753

• 573

• 375

• 357

Open Ended

There is a 3 digit number with 4, 8, 2 . Rounded to the hundred it would be 500. What is the number?

Addition Table

Some times you can use an addition table to add numbers.

Some numbers are odd like 1, 3, 5, 7, 9

Some numbers are even like 0, 2, 4, 6, 8

Multiple Choice

Look at the shaded sums .... which statement below is true

• If you add 2 odd numbers, the answer is always odd

• If you add 2 odd numbers, the answer is always even

• If you add an odd number and an even number, the answer is always even

• If you add 2 even numbers, the answer is always odd

Multiple Choice

Look at the shaded sums, which statement below is true

• if you had 2 odd numbers, the answer will be odd

• if you had 2 odd numbers, the answer will be even

• If you add 2 even numbers, the answer will be odd

• If you add 2 even numbers, the answer will be even

Rounding

• Sometimes you have to round TWICE

• The number is 678

• We will first round to the nearest hundred - 678 is close to 700

• Next we will round to the nearest ten - 678 is close to 680

Multiple Select

Select all the numbers that round to 800 when rounded to the nearest hundred and ten

• 756

• 792

• 795

• 802

• 806

Multiple Select

Select all the numbers that round to 200 when rounded to the nearest hundred and ten

• 205

• 201

• 198

• 256

• 292

Multiple Select

Select all the numbers that round to 500 when rounded to the nearest hundred and ten

• 504

• 510

• 456

• 497

• 491

Rounding to Add

125 + 456 would be 100 + 500 = 600

Multiple Choice

Estimate: 147 + 357

• 100 + 300 = 400

• 100 + 400 = 500

• 200 + 300 = 500

• 200 + 400 = 600

Multiple Choice

Estimate: 369 + 258

• 300 + 200 = 500

• 300 + 300 = 600

• 400 + 300 = 700

• 400 + 200 = 600

Multiple Choice

Estimate: 456 + 789

• 400 + 700 = 1100

• 500 + 700 = 1200

• 800 + 400 = 1200

• 500 + 800 = 1300

Are there any questions?

Let's go to Performance Matters :)