Unit 2 Review

Unit 2 Review

Estimation and Number Theory Test Prep 

Rounding 

Let's Review 

Multiple Choice

Round 698 to the nearest hundred.

• 600

• 680

• 670

• 700

How to Answer a Rounding Question 

• Circle the place value that you are rounding to. 

• Underline the digit to the right out it. 

• Ask yourself if this number rounds up or down. Remember 4 or less, let it REST. 5 or more RAISE THE SCORE.

• Then round accordingly. 

Multiple Choice

Round 85 to the nearest ten.

• 80

• 100

• 90

• 85

Open Ended

Round the number to the nearest thousand.

3,516 __________

Sentence Stem: 3,516 rounded to the nearest thousand is _____.

Estimation 

Use estimation to get numbers that are easier to solve with. 

Multiple Choice

68,354 + 30,879 can be estimated as 68,000 + 31,000

• True

• False

Multiple Choice

What is the closest estimate of 68 x 4

• 60 x 4

• 70 x 4

• 60 x 0

• 70 x 0

Open Ended

Multiply then estimate to check that your answer is reasonable.

807 x 4 = __________

Estimate:

__________ x 4 = __________

Factors

Remember factors are the two numbers you multiply together to get a product.

Open Ended

What are the factors of 15?

Sentence Stem: The factors of 15 are ____, ____, ____, and ____.

Open Ended

What is the FIRST common multiple of 4 and 5?

The first common multiple of 4 and 5 is _____.

Multiple Choice

Which statement is true?

• 6 is a common factor of 13 and 36

• 3 is a common factor of 12 and 24

• 5 is a common factor of 65 and 123

• 2 is a common factor of 4 and 5

Open Ended

What are the COMMON MULTIPLES of 30 and 12?

Sentence Stem: The common multiples of 30 and 12 are ___, ____, ____, ____, and ______.

Multiplying Using Models 

Area Models and Arrays